Hello everyone!

I'm using RadOutlookBar as a region in my Prism application. RadOutlookBarItems are being dynamically loaded to that region as its views. All RadOutlookBarItems are the same:

<telerikNavigation:RadOutlookBarItem x:Name="outlookBarItem">
		<telerikNavigation:RadTreeView Name="NavigaionTree" SelectionMode="Single" ItemTemplate="{StaticResource Section}"
										ItemsSource="{Binding Path=AppNavigationItems}" 
										SelectedItem="{Binding Mode=TwoWay, Path=CurrentAppNavigationItem}"
										MouseDoubleClick="NavigaionItemDoubleClick"
										MouseDown="NavigaionItemMouseDown"
										IsSingleExpandPath="True" 
										IsExpandOnSingleClickEnabled="True" 
										IsExpandOnDblClickEnabled="False"
										IsLineEnabled="True">
			<telerikNavigation:RadContextMenu.ContextMenu>
				<telerikNavigation:RadContextMenu Name="contextMenu">
					<telerikNavigation:RadMenuItem Header="Развернуть" Name="ExpandButton" Click="ExpandButtonClick"/>
					<telerikNavigation:RadMenuItem Header="Свернуть" Name="ReduceButton" Click="ReduceButtonClick"/>
					<telerikNavigation:RadMenuItem Header="Открыть" Name="NewTabButton" Click="NewTabButtonClick"/>
					<telerikNavigation:RadMenuItem Header="Открыть в фоновой вкладке" Name="ShadowTabButton" Click="ShadowTabButtonClick"/>
				</telerikNavigation:RadContextMenu>
			</telerikNavigation:RadContextMenu.ContextMenu>
			<telerikNavigation:RadTreeView.Background>
				<SolidColorBrush Color="White"/>
			</telerikNavigation:RadTreeView.Background>
		</telerikNavigation:RadTreeView>
	</telerikNavigation:RadOutlookBarItem>

During runtime I want to manipulte with RadMenuItms in every view:

private void NavigaionItemMouseDown(object sender, MouseButtonEventArgs e)
        {
            if (sender is RadTreeViewItem)
            {
                var treeViewitem = sender as RadTreeViewItem;
                treeViewitem.IsSelected = true;
                e.Handled = true;
                if (treeViewitem.HasItems)
                {
                    this.NewTabButton.Visibility = Visibility.Collapsed;
                    this.ShadowTabButton.Visibility = Visibility.Collapsed;
                    this.ExpandButton.Visibility = Visibility.Visible;
                    this.ReduceButton.Visibility = Visibility.Visible;
                    this.ExpandButton.IsEnabled = !treeViewitem.IsExpanded;
                    this.ReduceButton.IsEnabled = treeViewitem.IsExpanded;
                }
                else
                {
                    this.ExpandButton.Visibility = Visibility.Collapsed;
                    this.ReduceButton.Visibility = Visibility.Collapsed;
                    this.NewTabButton.Visibility = Visibility.Visible;
                    this.ShadowTabButton.Visibility = Visibility.Visible;
                }
            }
        }


public AppNavigationView()
        {
            InitializeComponent();
 
            EventManager.RegisterClassHandler(typeof(RadTreeViewItem),
                MouseRightButtonDownEvent, new MouseButtonEventHandler(NavigaionItemMouseDown), false);
        }


But unfortunately my logic works well only in the first RadOutlookBarItem. It also works for every other 

RadOutlookBarItem, but the result PopUp still consists of 4 items.

Please help me solve this "miracle".

Thank you in advance.

I have tree charts (one bar and two pies) in the screen and I want to export them to one file. It could be in same sheet or different sheets (one by chart). How do this?