Implement SelectedItem for CellSelection

[Wowhere]

Implement SelectedItem for CellSelection

I want to know how to implement SelectedItem property for CellSelection.

XAML below is working if i define HintsGridData.RowSelection.SelectedItem but i cant use SelectedItem for CellSelection. How to implement this?

<TreeDataGrid x:Name="resultGrid" Source="{Binding HintsGridData}" HorizontalAlignment="Stretch"
	   BorderThickness="2" BorderBrush="Gray" CanUserResizeColumns="True" >
	<TreeDataGrid.ContextMenu>
		<ContextMenu>
			<MenuItem Header="Copy" Command="" />
			<MenuItem Header="Execute" Command=""/>	
			<MenuItem Header="Open in browser"/>	
			<MenuItem Header="---"/>	
			<MenuItem Header="Delete" Command="{Binding DeleteHintCommand}" CommandParameter="{ReflectionBinding HintsGridData.RowSelection.SelectedItem}"  IsEnabled="{Binding IsGridEditable}"/>	
		</ContextMenu>
	</TreeDataGrid.ContextMenu>
</TreeDataGrid>