I have a XamDataGrid that is binded to a list of 'MyItem' objects.

I am trying to add a context-menu to group headers in my XamDataGrid, so I have the following defined in my Xaml file:

<ContextMenu x:Key="contextMenu_GroupByRecordPresenter">

  <MenuItem x:Name="menuItemCheckItems" Header="Check Items"

            Click="menuItemGRP_CheckItems_Click" />

  <MenuItem x:Name="menuItemOpenItems" Header="Open Items" Click="…"  />

</ContextMenu>

<Style TargetType="{x:Type igDP:GroupByRecordPresenter}">

  <Setter Property="ContextMenu"

         Value="{StaticResource contextMenu_GroupByRecordPresenter}" />

  <EventSetter Event="ContextMenuOpening" Handler="GRP_ContextMenuOpening" />

</Style>

And in the code behind:

private void menuItemGRP_CheckItems_Click(object sender, RoutedEventArgs e)

{ }

When the user selects the 'Check Items' item on the context-menu, I need to get all the 'MyItem' objects under this group header.

So, in code behind

1. How do I get them?

2. I may need to disable the 'Check items' item in the context-menu if the group header contains other group-headers under it, so how can I know that?