[TemplatePart(Name = "PART_Popup", Type = typeof(ComboDropDownWindow))]
[TemplatePart(Name = "PART_DropDownChild", Type = typeof(Control))]
[TemplatePart(Name = "PART_DropDownToggle", Type = typeof(ToggleButton))]
[TemplatePart(Name = "PART_EditHost", Type = typeof(Control))]
[StyleTypedProperty(Property = "DropDownButtonStyle", StyleTargetType = typeof(DropDownButton))]
[StyleTypedProperty(Property = "DropDownWindowStyle", StyleTargetType = typeof(ComboDropDownWindow))]
[StyleTypedProperty(Property = "DropDownControlStyle", StyleTargetType = typeof(Control))]
[StyleTypedProperty(Property = "EditBoxStyle", StyleTargetType = typeof(Control))]
[StyleTypedProperty(Property = "SpinButtonStyle", StyleTargetType = typeof(SpinButton))]
[TemplateVisualState(Name = "Disabled", GroupName = "CommonStates")]
[TemplateVisualState(Name = "ReadOnly", GroupName = "CommonStates")]
[TemplateVisualState(Name = "MouseOver", GroupName = "CommonStates")]
[TemplateVisualState(Name = "Normal", GroupName = "CommonStates")]
[TemplateVisualState(Name = "ActiveDropDown", GroupName = "ActiveStates")]
[TemplateVisualState(GroupName = "SpinButtonStates", Name = "SpinButtonCollapsed")]
[TemplateVisualState(GroupName = "SpinButtonStates", Name = "SpinButtonVisible")]
[TemplateVisualState(GroupName = "DropDownButtonStates", Name = "DropDownButtonCollapsed")]
[TemplateVisualState(GroupName = "DropDownButtonStates", Name = "DropDownButtonVisible")]
public class GcComboBox : ControlBase, IAnimatable, IFrameworkInputElement, IInputElement, IQueryAmbient, ISupportInitialize

<TemplatePart(Name:="PART_Popup", Type:=GetType(ComboDropDownWindow))>
<TemplatePart(Name:="PART_DropDownChild", Type:=GetType(Control))>
<TemplatePart(Name:="PART_DropDownToggle", Type:=GetType(ToggleButton))>
<TemplatePart(Name:="PART_EditHost", Type:=GetType(Control))>
<StyleTypedProperty(Property:="DropDownButtonStyle", StyleTargetType:=GetType(DropDownButton))>
<StyleTypedProperty(Property:="DropDownWindowStyle", StyleTargetType:=GetType(ComboDropDownWindow))>
<StyleTypedProperty(Property:="DropDownControlStyle", StyleTargetType:=GetType(Control))>
<StyleTypedProperty(Property:="EditBoxStyle", StyleTargetType:=GetType(Control))>
<StyleTypedProperty(Property:="SpinButtonStyle", StyleTargetType:=GetType(SpinButton))>
<TemplateVisualState(Name:="Disabled", GroupName:="CommonStates")>
<TemplateVisualState(Name:="ReadOnly", GroupName:="CommonStates")>
<TemplateVisualState(Name:="MouseOver", GroupName:="CommonStates")>
<TemplateVisualState(Name:="Normal", GroupName:="CommonStates")>
<TemplateVisualState(Name:="ActiveDropDown", GroupName:="ActiveStates")>
<TemplateVisualState(GroupName:="SpinButtonStates", Name:="SpinButtonCollapsed")>
<TemplateVisualState(GroupName:="SpinButtonStates", Name:="SpinButtonVisible")>
<TemplateVisualState(GroupName:="DropDownButtonStates", Name:="DropDownButtonCollapsed")>
<TemplateVisualState(GroupName:="DropDownButtonStates", Name:="DropDownButtonVisible")>
Public Class GcComboBox
    Inherits ControlBase
    Implements IAnimatable, IFrameworkInputElement, IInputElement, IQueryAmbient, ISupportInitialize

Remarks

The text box either displays the current selection or is empty if there is no selected item.

If you populate a combo box with items that inherit from UIElement, the selected item can only appear in the visual tree one time. This means if an item is selected, it will appear in the selection box, and not in the drop-down list of items. When it is no longer the selected item, it will reappear in the drop-down list. If items do not inherit from UIElement, they can appear in both the selection box and the drop-down list at the same time.

There are two mode to present the data items in a GcComboBox drop-down window, which is specified by the UseMultipleColumn property.

Columns and Items

Set UseMultipleColumn to true, GcComboBox will present data in a customizable grid.

By default, the GcComboBox control generates columns automatically when you set the ItemsSource or Items property. The generated columns are of type ListCheckBoxColumn for bound bool properties, and of type ListImageColumn for bound ImageSource properties, and of type ListTextColumn for all other properties.

Regardless of whether you generate columns, you can use the Columns collection to programmatically add, insert, remove, and change any columns in the control at run time. Alternatively, you can specify columns in XAML, in which case you should set AutoGenerateColumns to false. Creating your own columns enables you to use additional column types, such as the ListTemplateColumn type or custom column types. The ListTemplateColumn type provides an easy way to create a simple custom column. The SubItemTemplate property enable you to specify content templates for display.

If you set ListItem to Items or ItemsSource, you must be create ListSubItemColumn to display SubItem customized in SubItems.

Set UseMultipleColumn to false, GcComboBox will present data items with default presentation.
GcComboBox will generated ListItemBase as item container for set item data. If you define the ListItem as item data, the ListItem.Content or the SubItem.Content of the first SubItem in the SubItems will be wrapped into the generated ListItemBase to present.

You can retrieve the combo box's selected item by using the SelectedItem property, or retrieve the index of the selected item by using the SelectedIndex property.

Customizing the GcComboBox Control

You can apply a style to each item displayed in the GcComboBox by setting the ItemContainerStyle property.
To apply the same property settings to multiple GcComboBox controls, use the Style property. To change the visual structure and visual behavior of a GcComboBox, copy and modify its default style and template.
Dependency properties for this control might be set by the default style of the control. If a dependency property for a GcComboBox is set by its default style, the property might change from its default value when the GcComboBox appears in the application.

Supported VisualState list:

VisualStateGroup Name	VisualState Name	Description
CommonStates	Normal	Represents the visual appearance when control is in normal state.
CommonStates	Disabled	Represents the visual appearance when IsEnabled is false.
CommonStates	MouseOver	Represents the visual appearance when IsActive is true.
ActiveStates	ActiveDropDown	Represents the visual appearance when IsActive and IsDropDownOpen is true.
ActiveStates	Active	Represents the visual appearance when IsActive is true.
ActiveStates	Inactive	Represents the visual appearance when IsActive is false.
ValidationStates	Valid	Represents the visual appearance when System.Windows.Controls.Validation.GetHasError(System.Windows.DependencyObject) returns false.
ValidationStates	InvalidFocused	Represents the visual appearance when System.Windows.Controls.Validation.GetHasError(System.Windows.DependencyObject) returns true and control has focus.
ValidationStates	InvalidUnfocused	Represents the visual appearance when System.Windows.Controls.Validation.GetHasError(System.Windows.DependencyObject) returns true and control has no focus.

Constructors

Name	Description
GcComboBox()	Initializes a new instance of the GcComboBox class.

Fields

Name	Description
AllowDropDownOpenProperty	Identifies the AllowDropDownOpen dependency property.
AlternatingItemBackgroundProperty	Identifies the AlternatingItemBackground DependencyProperty.
AlternationCountProperty	Identifies the AlternationCount DependencyProperty.
AutoGenerateColumnsProperty	Identifies the AutoGenerateColumns DependencyProperty.
AutoOpenDropDownProperty	Identifies the AutoOpenDropDown dependency property.
AutoSelectProperty	Gets or sets a value that indicates whether the item is automatically selected when the prefix is entered.
CanUserResizeColumnsProperty	Identifies the CanUserResizeColumns DependencyProperty.
CanUserSortColumnsProperty	Identifies the CanUserSortColumns DependencyProperty.
CheckOnClickProperty	Identifies the CheckOnClick DependencyProperty.
ContentPathProperty	Identifies the ContentPath dependency property.
DisabledBackgroundProperty	Identifies the DisabledBackground dependency property.
DisabledForegroundProperty	Identifies the DisabledForeground dependency property.
DropDownButtonStyleProperty	Indicates the GrapeCity.Windows.InputMan.GcComboBox.DropDownButtonStyle DependencyProperty.
DropDownButtonVisibilityProperty	Identifies the GrapeCity.Windows.InputMan.GcComboBox.DropDownButtonVisibility dependency property.
DropDownControlStyleProperty	Identifies the DropDownControlStyle DependencyProperty
DropDownWidthProperty	Identifies the GrapeCity.Windows.InputMan.GcComboBox.DropDownWidth DependencyProperty.
DropDownWindowStyleProperty	Identifies the DropDownWindowStyle DependencyProperty
EditBoxStyleProperty	Identifies the EditBoxStyle dependency property.
EditableBackgroundProperty	Identifies the EditableBackground dependency property.
EditableTemplateProperty	Identifies the EditableTemplate dependency property.
ExitOnLeftRightKeyProperty	Identifies the ExitOnLeftRightKey dependency property.
FocusDropDownControlOnOpenProperty	Identifies the FocusDropDownControlOnOpen DependencyProperty
HorizontalGridLineBrushProperty	Identifies the HorizontalGridLineBrush DependencyProperty.
HorizontalGridLineStyleProperty	Identifies the HorizontalGridLineStyle DependencyProperty.
IsAutoSelectCaseSensitiveProperty	Gets or sets a value that indicates whether case is a condition when searching for items.
IsDropDownOpenProperty	Identifies the IsDropDownOpen dependency property.
IsEditableProperty	Identifies the IsEditable dependency property.
IsReadOnlyProperty	Identifies the IsReadOnly dependency property.
IsSelectableProperty	Identifies the IsSelectable dependency property.
IsSelectionBoxHighlightedProperty	Identifies the IsSelectionBoxHighlighted dependency property.
IsSynchronizedWithCurrentItemProperty	Identifies the IsSynchronizedWithCurrentItem DependencyProperty.
ItemBackgroundProperty	Identifies the ItemBackground DependencyProperty.
ItemCheckBoxVisibilityProperty	Identifies the ItemCheckBoxVisibility DependencyProperty.
ItemContainerStyleProperty	Identifies the ItemContainerStyle DependencyProperty.
ItemTemplateProperty	Identifies the ItemTemplate DependencyProperty.
ItemsSourceProperty	Identifies the ItemsSource dependency property.
MaxDropDownHeightProperty	Identifies the GrapeCity.Windows.InputMan.GcComboBox.MaxDropDownHeight DependencyProperty.
MaxDropDownItemsProperty	Identifies the GrapeCity.Windows.InputMan.GcComboBox.MaxDropDownItems DependencyProperty.
SelectedIndexProperty	Identifies the SelectedIndex dependency property.
SelectedItemProperty	Identifies the SelectedItem dependency property.
SelectedValuePathProperty	Identifies the SelectedValuePath dependency property.
SelectedValueProperty	Identifies the SelectedValue dependency property.
SelectionBoxItemProperty	Identifies the SelectionBoxItem dependency property.
SelectionBoxItemTemplateProperty	Identifies the SelectionBoxItemTemplate dependency property.
SelectionChangedEvent	Identifies the SelectionChanged routed event.
SpinButtonStyleProperty	Identifies the SpinButtonStyle DependencyProperty.
SpinButtonVisibilityProperty	Identifies the GrapeCity.Windows.InputMan.GcComboBox.SpinButtonVisibility DependencyProperty.
StaysOpenOnEditProperty	Identifies the StaysOpenOnEdit DependencyProperty
TextProperty	Identifies the Text dependency property.
UnEditableTemplateProperty	Identifies the EditableTemplate dependency property.
UseMultipleColumnProperty	Identifies the UseMultipleColumn DependencyProperty.
VerticalGridLineBrushProperty	Identifies the VerticalGridLineBrush DependencyProperty.
VerticalGridLineStyleProperty	Identifies the VerticalGridLineStyle DependencyProperty.

Properties

Name	Description
AllowDropDownOpen	Gets or sets a value indicating whether allow to open drop down window or not. This is a dependency property.
AlternatingItemBackground	Gets or sets the Brush that is used to paint the background of dropdown item whose AlternationIndex is 1.
AlternationCount	Gets or sets the number of alternating item containers in the GcComboBox, which enables alternating containers to have a unique appearance. This is a dependency property.
AutoGenerateColumns	Gets or sets a value indicating whether auto generate columns. This is a dependency property.
AutoOpenDropDown	Gets or sets a bool value indicates the drop-down window auto shown when GcComboBox gets focus. This is a dependency property.
AutoSelect	Gets or sets a value that indicates whether the item is automatically selected when the prefix is entered.
CanUserResizeColumns	Gets or sets a value that indicates whether the user can adjust column widths using the mouse. This is a dependency property.
CanUserSortColumns	Gets or sets a value that indicates whether the user can sort columns by clicking the column header. This is a dependency property.
CheckOnClick	Gets or sets a value indicating whether mouse click action in the ListItem will change the IsChecked property value. This is a dependency property.
CheckedItems	Gets the all ListItems whose IsChecked property is true. This is a read only dependency property.
ClearCommand	Represents the ClearCommand command, which requests that GcComboBox to clear all the text.
Columns	Gets a collection that contains all the columns in the control.
ContentPath	Gets or sets a value indicates the name of the property that is displayed in GcComboBox. This is a dependency property.
DisabledBackground	Gets or sets a brush that describes the background of a control when it is disabled.
DisabledForeground	Gets or sets a brush that describes the foreground of a control when it is disabled.
DropDownButtonStyle	Gets or sets a style which is used to render the dropdown button.
DropDownButtonVisibility	Gets or sets the GrapeCity.Windows.InputMan.ButtonVisibility of the dropdown button. This is a dependency property.
DropDownControlStyle	Gets or sets a style which is used to render the drop-down control. This is a dependency property.
DropDownWidth	Gets or sets the width of the dropdown window. This is a dependency property.
DropDownWindowStyle	Gets or sets the Style for the GrapeCity.Windows.InputMan.Primitives.DropDownWindow. This is a dependency property.
EditBoxStyle	Gets or sets a style which is used to render the edit box. This is a dependency property.
EditableBackground	Gets or sets a brush that describes the background of a control when GcComboBox.IsEditable is true.
EditableTemplate	Gets or sets a template which will be used when IsEditable is set to true. This is a dependency property.
ExitOnLeftRightKey	Gets or sets whether the focus automatically moves to the previous or next tab ordering control when pressing the left, right arrow keys.
FocusDropDownControlOnOpen	Gets or sets a value that indicates whether focus the drop-down listbox when drop-down window opened. This is a dependency property.
HorizontalGridLineBrush	Gets or sets a Brush used to paint the horizontal grid lines. This is a dependency property.
HorizontalGridLineStyle	Gets or sets a GrapeCity.Windows.InputMan.LineStyle enumeration value that indicates the horizontal grid line style for each lines. This is a dependency property.
IsAutoSelectCaseSensitive	Gets or sets a value that indicates whether case is a condition when searching for items.
IsDropDownOpen	Gets or sets a value that indicates whether the drop-down for a GcComboBox is currently open. This is a dependency property.
IsEditable	Gets or sets a value that indicates whether user can edit value in the GcComboBox. This is a dependency property.
IsReadOnly	Gets or sets a value indicating whether this control is read only.
IsSelectable	Gets or sets a value indicating whether the items can be selected.
IsSelectionBoxHighlighted	Gets a value that indicates whether highlight the selected items. This is a dependency property.
IsSynchronizedWithCurrentItem	Gets or sets a value that indicates whether the GcComboBox should keep the SelectedItem synchronized with the current item in the Items property. This is a dependency property.
ItemBackground	Gets or sets the Brush that is used to paint the background of dropdown item whose AlternationIndex is 0.
ItemCheckBoxVisibility	Gets or sets a value that indicates the visibility of CheckBox in the first sub item of each ListItem. This is a dependency property.
ItemContainerGenerator	Gets the item container generator.
ItemContainerStyle	Gets or sets the style that is used when rendering the item containers. This is a dependency property.
ItemTemplate	Gets or sets the DataTemplate used to display each item.
Items	Gets the collection used to generate the content of the GcComboBox.
ItemsSource	Gets or sets a collection that is used to generate the content of the control. This is a dependency property.
MaxDropDownHeight	Gets or sets the maximum height of the dropdown window. This is a dependency property.
MaxDropDownItems	Gets or sets the maximum drop-down items. This is a dependency property.
SelectedIndex	Gets or sets the displayed index of the selected item. This is a dependency property.
SelectedItem	Gets or sets the selected item. This is a dependency property.
SelectedValue	Gets or sets a value of the selected item, obtained by using the SelectedValuePath. This is a dependency property.
SelectedValuePath	Gets or sets the property path that is used to get the SelectedValue property of the SelectedItem property. This is a dependency property.
SelectionBoxItem	Gets the selected item in the GcComboBox. This is a dependency property.
SelectionBoxItemTemplate	Gets the template of SelectionBoxItem. This is a dependency property.
SpinButtonStyle	Gets or sets a Style which used to render GrapeCity.Windows.InputMan.Primitives.SpinButton. This is a dependency property.
SpinButtonVisibility	Gets or sets the GrapeCity.Windows.InputMan.ButtonVisibility of the spin button. This is a dependency property.
SpinDownCommand	Represents the SpinDownCommand command, which requests SpinDown button clicked.
SpinUpCommand	Represents the SpinUpCommand command, which requests SpinUp button clicked.
StaysOpenOnEdit	Gets or sets a value indicates whether a GcComboBox that is open and displays a drop-down control will remain open when a user clicks the TextBox. This is a dependency property.
SwitchDropDownCommand	Represents the SwitchDropDownCommand command, which switched the drop down window between open and closed.
Text	Gets or sets the text associated with this control. This is a dependency property.
UnEditableTemplate	Gets or sets a template which will be used when IsEditable is set to false. This is a dependency property.
UseMultipleColumn	Gets or sets a value indicating whether use grid to show data. This is a dependency property.
VerticalGridLineBrush	Gets or sets a Brush used to paint the vertical grid lines. This is a dependency property.
VerticalGridLineStyle	Gets or sets a GrapeCity.Windows.InputMan.LineStyle enumeration value that indicates the vertical grid line style for each lines. This is a dependency property.

Methods

Name	Description
BeginInit()	Starts the initialization process for this element.
EndInit()	Indicates that the initialization process for the element is complete.
GetItemDisplayIndex(int)	Gets the item displayed index.
GetItemIndex(int)	Gets the item index based on Items.
OnApplyTemplate()	When overridden in a derived class, is invoked whenever application code or internal processes call ApplyTemplate().
OnAutoGeneratingColumn(AutoGeneratingListColumnEventArgs)	Raises the AutoGeneratingColumn event.
OnDropDownClosed(EventArgs)	Raises the DropDownClosed event.
OnDropDownOpened(EventArgs)	Raises the DropDownOpened event.
OnGotKeyboardFocus(KeyboardFocusChangedEventArgs)	Invoked when an unhandled System.Windows.Input.Keyboard.GotKeyboardFocus attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.
OnItemCheckChanged(ItemCheckEventArgs)	Raises the ItemCheck event.
OnKeyExit(KeyExitEventArgs)	Raises the KeyExit event.
OnLostKeyboardFocus(KeyboardFocusChangedEventArgs)	Invoked when an unhandled System.Windows.Input.Keyboard.LostKeyboardFocus attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.
OnMouseEnter(MouseEventArgs)	Invoked when an unhandled MouseEnter event is raised on this element. Implement this method to add class handling for this event.
OnMouseLeave(MouseEventArgs)	Invoked when an unhandled MouseLeave event is raised on this element. Implement this method to add class handling for this event.
OnMouseLeftButtonUp(MouseButtonEventArgs)	Invoked when an unhandled MouseLeftButtonUp routed event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.
OnMouseWheel(MouseWheelEventArgs)	Called before the MouseWheel event occurs to provide handling for the event in a derived class without attaching a delegate.
OnPrepareListItem(PrepareListItemEventArgs)	Raises the PrepareListItem event.
OnPreviewKeyDown(KeyEventArgs)	Invoked when an unhandled System.Windows.Input.Keyboard.PreviewKeyDown attached event reaches an element in its route that is derived from this class. Implement this method to add class handling for this event.
OnPropertyChanged(DependencyPropertyChangedEventArgs)	Invoked whenever the effective value of any dependency property on this FrameworkElement has been updated. The specific dependency property that changed is reported in the arguments parameter. Overrides System.Windows.DependencyObject.OnPropertyChanged(System.Windows.DependencyPropertyChangedEventArgs).
OnSelectionChanged(SelectionChangedEventArgs)	Raises the GrapeCity.Windows.InputMan.GcComboBox.SelectionChanged event.
OnTextChanged(RoutedEventArgs)	Is called when content in this control changes.
OnTextChanging(TextChangingEventArgs)	Raises the TextChanging event.
OpenDropDown()	Open drop down window of control.
Sort(ListColumn, ListSortDirection?)	Sorts the specified ListColumn with specific direction.

Events

Name	Description
AutoGeneratingColumn	Occurs one time for each public, non-static property in the bound data type when the ItemsSource property is changed and the AutoGenerateColumns property is true.
DropDownClosed	Occurs when the GrapeCity.Windows.InputMan.Primitives.DropDownWindow of a GcComboBox is closed.
DropDownOpened	Occurs when the GrapeCity.Windows.InputMan.Primitives.DropDownWindow of a GcComboBox is opened.
ItemCheck	Occurs when the GrapeCity.Windows.InputMan.ListItem.IsChecked is changed.
KeyExit	Occurs when input some special keys to make the control lose focus.
PrepareListItem	Occurs one time when preparing the ListItem to present the data.
SelectionChanged	Occurs when the value of the SelectedItem property on this element changes.
TextChanged	Occurs when content is changed in the text element.
TextChanging	Occurs just before the text is changed in the control.