Problem adding RadDocumentPane to RadPaneGroup

[C Bates]

UPDATE:

It seems multiple objects can't have the same name if they will be added to a Telerik collection.

In our application, the content we added to the RadDockingPanes included a canvas, and the Canvas object was getting the same name for each pane.

    newCanvas.Name = CanvasName;

When I removed that, it works as expected.

Hello,

Using the Q3 release.  In my xaml I have

    <docking:RadDocking x:Name="Docking" Grid.Row="1" >
        <docking:RadSplitContainer x:Name="dockLeft" >
            <docking:RadPaneGroup x:Name="toolsGroup" >
                <docking:RadPane IsPinned="False" IsHidden="False" CanDockInDocumentHost="False">
                            <!-- stuff -->
                </docking:RadPane>
                <docking:RadPane IsPinned="False" IsHidden="False" CanDockInDocumentHost="False" CanUserClose="False">
                </docking:RadPane>
            </docking:RadPaneGroup>
        </docking:RadSplitContainer>
        <docking:RadDocking.DocumentHost>
            <docking:RadSplitContainer x:Name="splitContainer1">
                <docking:RadPaneGroup x:Name="mapGroup" >
                </docking:RadPaneGroup>
                <docking:RadPaneGroup x:Name="rightMapGroup">
                </docking:RadPaneGroup>
            </docking:RadSplitContainer>
        </docking:RadDocking.DocumentHost>
    </docking:RadDocking>

In code I try to add RadDocumentPanes.

            RadDocumentPane newPane = new RadDocumentPane();
            newPane.Header = new TextBlock() {
                Text = "Header"
            };
            newPane.Content = new TextBlock() {
                Text = "Content"
            };
            newPane.CanFloat = false;
            newPane.CanDockInDocumentHost = false;
            newPane.CanUserClose = false;

            mapGroup.Items.Add(newPane);

For the simple content shown above, this works as expected, for as many panes as I want to add.

However, with more complicated content:

Grid

-- Grid

---- StackPanel

---- Canvas

---- ScrollViewer

---------- Canvas

---------- Slider

etc.

The first pane adds as expected, but trying to add a second pane throws this exception:

Value does not fall within the expected range.

What am I doing wrong?

(mapGroup.AddItem(newPane, DockPosition.Left)  works as expected, but that is not what I want.)

Thanks for the help...

[C Bates]

Solution is in UPDATE in original post.

(I was looking for the option to mark this question as answered...)

[Edward]

Is this being done in code behind? 

If this was done in a viewmodel then how would you get a reference for the RadPaneGroup element -- mapGroup?