GroupHeaderTap Command

Updated on Mar 26, 2026

The GroupHeaderTap command handles the tap gesture over a group header. The default implementation will toggle (expand or collapse) the underlying IDataGroup implementation.

Execution Parameter

The execution parameter is of type GroupHeaderContext and exposes the following properties:

• Level—Gets the zero-based level (depth) of the group within the current data View.
• Descriptor—Gets the GroupDescriptorBase instance that defines the grouping level for the group header that has been tapped.
• IDataGroup—Gets the IDataGroup implementation that represents the data group abstraction.
• IsExpanded—Gets or sets the current IsExpanded state of the associated data group.

Custom GroupHeaderTap Command

The following examples show how to create a class that inherits from the DataGridCommand and add it to the Commands collection.

Create a Custom GroupHeaderTap Command

C#

public class CustomGroupHeaderTapCommand : DataGridCommand
{
	public CustomGroupHeaderTapCommand()
	{
		this.Id = CommandId.GroupHeaderTap;
	}

	public override bool CanExecute(object parameter)
	{
		var context = parameter as GroupHeaderContext;
		// put your custom logic here
		return true;
	}

	public override void Execute(object parameter)
	{
		var context = parameter as GroupHeaderContext;
		// put your custom logic here     

		this.Owner.CommandService.ExecuteDefaultCommand(CommandId.GroupHeaderTap, context);          
	}
}

Add the Custom Command to the Commands Collection

XAML

<Grid xmlns:grid="using:Telerik.UI.Xaml.Controls.Grid">
	<grid:RadDataGrid Width="600" Height="460" x:Name="grid">
		<grid:RadDataGrid.Commands>
			<local:CustomGroupHeaderTapCommand/>
		</grid:RadDataGrid.Commands>
	</grid:RadDataGrid>
</Grid>

See Also

• ColumnHeaderTap
• CellTap
• CellDoubleTap
• FilterButtonTap