ListView Problem

Question

In my double-click function, How to i access my grid (Name="Level2" @ line 17) so that I can set it visibility to visible for the selected row?

If there are any possible way to implement the change of visibility on double-clicking the selected row in WPF is also very welcome...

1	<StackPanel Margin="8">
2
3	<ListView Name="listView" ItemsSource="{Binding}" MouseDoubleClick="listView_MouseDoubleClick">
4	<ListView.ItemTemplate>
5	<DataTemplate >
6	<Grid Name="GridMain" >
7	<Grid.RowDefinitions>
8	<RowDefinition></RowDefinition>
9	<RowDefinition></RowDefinition>
10	</Grid.RowDefinitions>
11
12	<!--Level 1 -->
13	<Grid Name="Level1" Grid.Row="0" Height="20" >
14	<TextBlock Text="{Binding col0}" Name="AA" />
15	</Grid>
16
17	<!--Level 2 -->
18	<Grid Name="Level2" Grid.Row="1" Visibility ="Collapsed">
19	<Grid.ColumnDefinitions>
20	<ColumnDefinition></ColumnDefinition>
21	<ColumnDefinition></ColumnDefinition>
22	</Grid.ColumnDefinitions>
23
24	<TextBlock Text="{Binding col1}" Grid.Column="0" Name="BB" />
25	<TextBlock Text="{Binding col2}" Grid.Column="1" Name="CC"/>
26	</Grid>
27
28	</Grid>
29
30	</DataTemplate>
31	</ListView.ItemTemplate>
32	</ListView>
33
34	</StackPanel>