Events

This article lists the events specific for the RadTabControl control.

• PreviewTabClosed: Occurs when a RadTabItem is about to be closed. The event arguments are of type PreviewTabChangedEventArgs and provide access to the following properties:

  • TabItem: The RadTabItem that has been changed.

  • DataContext: The DataContext of the changed RadTabItem.

    Example 1: PreviewTabClosed Event Handler

    • C#
    • VB.NET

            private void TabControl_PreviewTabClosed(object sender, Telerik.Windows.Controls.PreviewTabChangedEventArgs e) 
            { 
                if (e.TabItem.Header.ToString() == "Tab 1") 
                { 
                    e.Cancel = true; 
                } 
            } 

            Private Sub TabControl_PreviewTabClosed(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.PreviewTabChangedEventArgs) 
                If e.TabItem.Header.ToString() = "Tab 1" Then 
                    e.Cancel = True 
                End If 
            End Sub 

• TabClosed: Occurs when a RadTabItem is closed. The event arguments are of type TabChangedEventArgs and expose the following members:

  • TabItem: The RadTabItem that has been changed.

  • DataContext: The DataContext of the changed TabItem.

• PreviewTabUnpinned: Occurs when a RadTabItem is about to be unpinned. Event arguments are of of type PreviewTabChangedEventArgs.

  Example 2: PreviewTabUnpinned Event Handler

  • C#
  • VB.NET

      private void RadTabControl_PreviewTabUnpinned(object sender, Telerik.Windows.Controls.PreviewTabChangedEventArgs e) 
      { 
          MessageBox.Show($"{e.TabItem.Header} is about to be unpinned."); 
      } 

      Private Sub RadTabControl_PreviewTabUnpinned(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.PreviewTabChangedEventArgs) 
          MessageBox.Show($"{e.TabItem.Header} is about to be unpinned.") 
      End Sub 

• TabUnpinned: Occurs when a RadTabItem is unpinned. The event arguments are of type TabChangedEventArgs.

• PreviewTabPinned: Occurs when a RadTabItem is about to be pinned. The event arguments are of type PreviewTabChangedEventArgs.

  Example 3: PreviewTabPinned Event Handler

  • C#
  • VB.NET

      private void RadTabControl_PreviewTabPinned(object sender, Telerik.Windows.Controls.PreviewTabChangedEventArgs e) 
      { 
          e.Cancel = true; 
      } 

      Private Sub RadTabControl_PreviewTabPinned(ByVal sender As Object, ByVal e As Telerik.Windows.Controls.PreviewTabChangedEventArgs) 
          e.Cancel = True 
      End Sub 

• TabPinned: Occurs when a RadTabItem is pinned. The event arguments are of type TabChangedEventArgs.

• DropDownOpened: An event that is raised when the Telerik.Windows.Controls.TabControl.DropDownMenu is opened. This is a RoutedEvent. The event arguments are of type DropDownEventArgs and expose the following members:

  • DropDownItemsSource: Gets or sets the items collection for the drop down context menu.

  • RoutedEvent: Gets or sets the RoutedEventAgs.RoutedEvent associated with this RoutedEventArgs instance.

    Example 4: DropDownOpened Routed Event

    • C#
    • VB.NET

            private void RadTabControl_DropDownOpened(object sender, DropDownEventArgs e) 
            { 
                List<string> dropDownItems = e.DropDownItemsSource.Cast<string>().ToList<string>(); 
                dropDownItems.Add("New DropDown Item."); 
                e.DropDownItemsSource = dropDownItems; 
            } 

            Private Sub RadTabControl_DropDownOpened(ByVal sender As Object, ByVal e As DropDownEventArgs) 
                Dim dropDownItems As List(Of String) = e.DropDownItemsSource.Cast(Of String)().ToList(Of String)() 
                dropDownItems.Add("New DropDown Item.") 
                e.DropDownItemsSource = dropDownItems 
            End Sub 

• DropDownClosed: This event is raised when the Telerik.Windows.Controls.TabControl.DropDownMenu is closed. This is a RoutedEvent. The event arguments are of type DropDownEventArgs.

• ItemReordered: This event occurs when an item is reordered while dragging. This is a RoutedEvent. In order for this event to be raised, the AllowDragReorder property needs to be set to True. The event arguments are of type ItemReorderedEventArgs and expose the following members:

  • OldIndex: Gets the previous index of the dragged item.

  • NewIndex: Gets the next index of the dragged item.