# CellTap Command

The `CellTap` command handles the tap gesture over a grid cell. The default implementation will attempt to change the current selection based on the `SelectionMode` and `SelectionUnit` values.

## Execution Parameter

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

* `Column`—Gets the `DataGridColumn` instance with which the cell is associated.
* `Item`—Gets the underlying data row (`ViewModel` instance) with which the cell is associated.

## Custom CellTap 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 CellTap Command**

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

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

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

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

## See Also

* [FlyoutGroupHeader](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-flyoutgroupheadertapcommand)
* [ColumnHeaderTap](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-columnheadertapcommand)
* [CellDoubleTap](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-celldoubletappedcommand)
* [FilterButtonTap](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-filterbuttontapcommand)
* [CellPointerOver](https://www.telerik.com/winui/documentation/controls/raddatagrid/commands/datagrid-cellpointerovercommand)