Hiding wpf ContextMenu when the Data Grid is Empty?

Question

I am trying to make a simple TODO App with WPF using MVVM. I have the tasks in Datagrid and a right click context menu with Delete option. I don't want the context menu to show when there are no elements in Data Grid. What can I do to solve it?

<Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="*"/>
            
        </Grid.RowDefinitions>



   <DataGrid  ItemsSource="{Binding Path=TaskList}" SelectedItem="{Binding SelectedTask}" AutoGenerateColumns="False">

            <DataGrid.ContextMenu  >
                <ContextMenu>
                    <MenuItem Header="Delete" Command="{Binding OpenDialogCommand}"  CommandParameter="{Binding PlacementTarget.SelectedItem, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContextMenu}}}"></MenuItem>
                </ContextMenu>
            </DataGrid.ContextMenu>

            <DataGrid.Columns>
                <DataGridTextColumn Header="Priority" Width="auto" Binding="{Binding Path=Id}"/>
                
                <DataGridTextColumn Header="Task" Width="auto" Binding="{Binding Path=TaskName}"/>              
            </DataGrid.Columns>

           
        </DataGrid>

Answer 1

I got a simple hack to solve this. I changed the row definition from * to auto for row 2; This will stop context menu from showing when you click anywhere other than Datagrid Elements.

<RowDefinition Height="auto"/>

Also to remove one extra row which always shows(and display context menu when right clicked)

This worked.

    <DataGrid Margin ="10" x:Name="dgTaks" Grid.Row="1" Grid.ColumnSpan="2"  ItemsSource="{Binding Path=TaskList}" SelectedItem="{Binding SelectedTask}" AutoGenerateColumns="False" **CanUserAddRows="False"**>