Visual Studio behavior on a RadDocumentPane -- cannot see contents

[Erik]

Hi -- I've been working with the RadDocking framework and Prism, and am very happy with the way things are coming.
However, I've run into a snag with the Visual Studio designer for XAML on RadDocumentPane views.

My app is using a custom region adapter from these forums for the RadPaneGroup, which is working great.  The views that I create in my other projects are where the issue comes in.  The XAML for those views looks something like this (obviously more interesting than just a single hello world button).  Note that this is the whole file -- there is no encapsulating user control or anything. 

<telerikDocking:RadDocumentPane x:Class="Nwp.BackOffice.Settings.MatchingCriteria.RadDocumentPaneTest"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                     xmlns:telerikDocking="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Docking"
                     mc:Ignorable="d"
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <Button>Hello World</Button>
    </Grid>
</telerikDocking:RadDocumentPane>

In the designer view, all I can see is a 300x300 grey box -- none of the inside contents.  I *can* change it from a RadDocumentPane to a UserControl (top, bottom tags, then any Resources tags, etc.  This lets me see the contents properly, but then I have to go back and change it back before compile and run time.

Any insight as to how I might better play with the designer (have tried in VS 2010 Utilimate and VS 2012 Ultimate with same results).

Thanks in advance -

[Yana]

Hello Erik,

This is a known issue which is logged in our PITS, you can vote for it and track its progress here.

We are sorry for the inconvenience.

All the best,
Yana
the Telerik team