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Context Menu with ListBox

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Naren asked on 27 Sep 2010, 04:18 PM

Hi,
I am using ContextMenu.on ListBox.

My Xaml is as follows:

<Grid x:Name="LayoutRoot" Background="White">
        <ListBox x:Name="whatfirstAttributeList" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Disabled" dragDrop:RadDragAndDropManager.AllowDrag="True" FontWeight="Normal" >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Width="300" Background="{Binding Name, Converter={StaticResource myconverter}}">
                        <TextBlock Text="{Binding Name}" x:Name="AttributeList" FontSize="12"/>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
            <telerikNav:RadContextMenu.ContextMenu>
                <telerikNav:RadContextMenu x:Name="ContextMenu" ItemClick="ContextMenu_ItemClick" Opened="ContextMenu_Opened">
                    <telerikNav:RadMenuItem Header="Add Attribute" />
                    <telerikNav:RadMenuItem Header="Delete Attribute"/>
                </telerikNav:RadContextMenu>
            </telerikNav:RadContextMenu.ContextMenu>
        </ListBox>
    </Grid>

How can I get selected Item on ListBox in following cases?
1>
private void ContextMenu_Opened(object sender, RoutedEventArgs e)
        {
            if (this.whatfirstAttributeList.SelectedItem != null)
            {
this always returns Null.........
2>
private void ContextMenu_ItemClick(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            DataItem dataItem = this.selectedColumnItem.DataContext as DataItem;
This doesn't work....always give error....

6 Answers, 1 is accepted

answered on 28 Sep 2010, 01:06 PM

listboxandradcontextmenu.zip

Hello Naren,

Your SelectedItem is null because to actually select it you have to left click it. You can get the right clicked item with GetClickedElement method of the RadContextMenu. Please examine the attached project and if you have any further questions feel free to ask.

Best wishes,

Zarko

the Telerik team

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answered on 01 Oct 2010, 03:36 PM

listboxandradcontextmenu.zip

Hello Naren,

We are aware of such problem with RadContextMenu. In order to get the clicked element in a ChildWindow, I would suggest you to register the RadContextMenu with the ListBox in the ChildWindow.

Attached you can find the sample. I hope this helps.

Regards,
George
the Telerik team

answered on 06 Apr 2011, 10:33 PM

i got the following error when i used context menu in child control. I am using v.2011.1.315.1040.
"Value does not fall within the expected range.".....

My Xaml is as follows:

<controls:ChildWindow xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" x:Class="contextMenuDemo.ChildWindow1"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
   Width="400" Height="300"
   Title="ChildWindow1">
   <Grid x:Name="LayoutRoot" Margin="2">
   <Grid.RowDefinitions>
   <RowDefinition />
   <RowDefinition Height="Auto" />
   </Grid.RowDefinitions>
<TextBox Text="aaaa" Width="50" Height="30" >
<telerik:RadContextMenu.ContextMenu>
<telerik:RadContextMenu>
<telerik:RadMenuItem Header="copy" Click="RadMenuItem_Click"></telerik:RadMenuItem>
<telerik:RadMenuItem Header="paste" Click="RadMenuItem_Click"></telerik:RadMenuItem>
</telerik:RadContextMenu>
</telerik:RadContextMenu.ContextMenu>
</TextBox>
   </Grid>
</controls:ChildWindow>

can you please help on this quickly..