# ColumnHeaderTap Command

The `ColumnHeaderTap` command handles the tap gesture over a column header. The default implementation of this command will try to add a new `SortDescriptor` to the `SortDescriptors` collection of the DataGrid thus changing the current sorting of the data.

## Execution Parameter

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

* `Column`—Gets or sets the `DataGridColumn` instance when the header is tapped.
* `CanSort`—Determines whether the user is allowed to sort the data through the UI (as specified by the `RadDataGrid.UserSortMode` property).
* `IsMultipleSortAllowed`—Determines whether any existing sort will be cleared before new sort is applied (if any).

## Custom ColumnHeaderTap Command

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

#### **Create a Custom ColumnHeaderTap Command**

```C#
public class CustomColumnHeaderTapCommand : DataGridCommand
{
	public CustomColumnHeaderTapCommand()
	{
		this.Id = CommandId.ColumnHeaderTap;
	}

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

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

		this.Owner.CommandService.ExecuteDefaultCommand(CommandId.ColumnHeaderTap, 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:CustomColumnHeaderTapCommand/>
		</grid:RadDataGrid.Commands>
	</grid:RadDataGrid>
</Grid>
```

## See Also

* [GroupHeaderTap](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-groupheadertapcommand)
* [CellTap](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-celltapcommand)
* [CellDoubleTap](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-celldoubletappedcommand)
* [FilterButtonTap](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-filterbuttontapcommand)