New Post: ItemsControl + NavigationRequest

Hi List
my MainRegion looks like this:
<TabControl VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch" Foreground="#FF546780"

                        ItemContainerStyle="{DynamicResource TabHeaderStyle}"
                        prism:RegionManager.RegionName="{x:Static infra:RegionNames.MainRegion}">

                <TabControl.Background>

Now i'm adding a UserControl with a ListView to select Items by using RequestNavigate.
For each Selected Item there is another UserControl added to display-edit with RequestNavigate as well.
When selecting another Module from my Menu, only the 'Display-Edit' UC's are removed, the first UC, the ListView is untouched. Neither the OnNavigated....... nor the IsNavigationTarget methods are called.
If the ListView is the only Control in MainRegion all works as expected (TabItem is removed).
Did i have to add the 'Display-Edit' UC's by Region.Add(view) or is there any better idea.

Thanks
Peter

Any idea's.