Selection issues with TreeView in Ribbon

[Paul]

I am experiencing issues when selecting nodes within a treeview within a ribbon.  Please see the following link to see what I am talking about: http://gis.hudson.oh.us/ribbon
Select the "Select Map Views" dropdown button and you will see what I am referring to.  You need to click the node twice to execute the click event.  I only want the user to need to click ONCE.
XAML:

<telerik:RadRibbonDropDownButton x:Name="MapView_Button" Text="Map Theme" CollapseToSmall="WhenGroupIsSmall" Size="Large"
LargeImage="../Images/maptheme.png"  telerik:ScreenTip.Title="Select Map Theme"
telerik:ScreenTip.Description="Use this tool to select a theme for the map such as sanitary sewer or water.  By selecting these themes, layers from the selected theme will be displayed"

<telerik:RadRibbonDropDownButton.DropDownContent>

                    <StackPanel>
                    <telerik:RadGroupHeader Content="Clear Map Views"/>
                        <telerik:RadGallery ViewportHeight="50" ItemHeight="50" ItemWidth="250" ViewportWidth="250" >
                        <telerik:RadGalleryItem >
                            <telerik:RadRibbonButton x:Name="ClearMapView_Button" HorizontalAlignment="Center" Content="Clear Map View" Click="ClearMapView_Click" Padding="10" />
                        </telerik:RadGalleryItem>
                     </telerik:RadGallery>
                    <telerik:RadGroupHeader Content="Select Map View/Theme"></telerik:RadGroupHeader>
                        <telerik:RadGallery ViewportHeight="300" ItemHeight="300" ItemWidth="250" ViewportWidth="250" >
                            <telerik:RadGalleryItem>
                                <StackPanel>
<telerik1:RadTreeView x:Name="MapView_TreeView" Background="Transparent" BorderThickness="0" />
                                </StackPanel>
                        </telerik:RadGalleryItem>
</telerik:RadGallery>
                    </StackPanel>

                </telerik:RadRibbonDropDownButton.DropDownContent>

            </telerik:RadRibbonDropDownButton>

VB:

'Build map view treeview.
    Private Sub loadMapViewDropdown()
        Dim rootItem As Telerik.Windows.Controls.RadTreeViewItem = Nothing
        Dim childItem As Telerik.Windows.Controls.RadTreeViewItem
        Dim contentHolder As StackPanel
        Dim MVtextBlock As TextBlock
        Dim MVImage As Image
        Dim prevGroup As String = ""
        Dim mv As Globals.MapViews_Class

        'Init.
        MapView_Button.Text = ""
        MapView_Button.Text = "Set Map View"
        MapView_TreeView.Items.Clear()

        'Process all map views.
        For Each mv In Globals.MapViews

           'Add headings.
            If (mv.GroupName <> prevGroup) Then
                prevGroup = mv.GroupName
                rootItem = New Telerik.Windows.Controls.RadTreeViewItem
                rootItem.Header = mv.GroupName
                rootItem.Foreground = New SolidColorBrush(Colors.Black)
                rootItem.IsExpanded = True
                AddHandler rootItem.MouseLeftButtonUp, AddressOf mapViewClick
                MapView_TreeView.Items.Add(rootItem)

              End If

            'Define items for custom treeview items.
            contentHolder = New StackPanel
            MVImage = New Image
            MVtextBlock = New TextBlock
            childItem = New Telerik.Windows.Controls.RadTreeViewItem

            'Style Stackpanel
            contentHolder.Orientation = Orientation.Horizontal
            contentHolder.VerticalAlignment = Windows.VerticalAlignment.Center

            'Add image
            MVImage.Source = New BitmapImage(New Uri("../Images/" & mv.name & ".png", UriKind.Relative))
            contentHolder.Children.Add(MVImage)
            'Add text
            MVtextBlock.Text = mv.name
            MVtextBlock.VerticalAlignment = Windows.VerticalAlignment.Center
            contentHolder.Children.Add(MVtextBlock)

            childItem.Header = contentHolder
            childItem.Tag = mv.name
            childItem.Foreground = New SolidColorBrush(Colors.Black)
            childItem.Cursor = Cursors.Hand
            AddHandler childItem.MouseLeftButtonUp, AddressOf MapViewItem_Click
            rootItem.Items.Add(childItem)

            Next


    End Sub

    'Mapview treeview item selected event.
    Private Sub MapViewItem_Click(ByVal sender As System.Object, ByVal e As System.Windows.Input.MouseButtonEventArgs)
        Dim tvi As Telerik.Windows.Controls.RadTreeViewItem = DirectCast(MapView_TreeView.SelectedItem, Telerik.Windows.Controls.RadTreeViewItem)
        If (tvi Is Nothing) Then
            Exit Sub
        End If

        Dim txt As String = tvi.Tag.ToString

        'Set map view for treeview children only.
        If (tvi.Items.Count = 0) Then
            Globals.ActiveMapView = txt
            highlightMapViewItem(tvi)
            Util.SetActiveIdentifyMapView()
            MapView_Button.LargeImage = New BitmapImage(New Uri("../Images/" & txt & ".png", UriKind.Relative))
        End If
    End Sub

Thanks,

Paul Leedham

[Petar Mladenov]

Hi Paul,

It appears that the DropDownButtonContent (which  is a  Popup) handles the MouseLeftButtonUp event.
Therefore it is better to use the Selected event of the RadTreeView instead of the mentioned mouse event.
Please give it a try and let me know if this works for you. Feel free to ask if you need further assistance or more info.  
 
All the best,
Petar Mladenov
the Telerik team