Black area when RibbonWindow is maximized

Hi Guys,

RibbonWindow does not maximize correctly when the display configuration is changed. We noticed this when we docked a laptop onto a docking station with a bigger monitor than the laptop's.  The window will not maximize to the full extent of the monitor and a black area will appear as seen below:

It is also possible to reproduce the behavior on a desktop machine with two monitors of different sizes (I used one with 1920x1200 resolution and 1600x1200). Here are the steps:

1. Make the bigger monitor as the main display (Right click desktop -> Screen resolution -> Select monitor -> Tick "Make this my main display")
2. Turn off the bigger monitor
3. Run Actipro WPF Control Sample Browser
4. Turn on the bigger monitor (application should move to bigger monitor automatically)
5. Press the maximize button and black area should appear

Also, I could not reproduce this behavior when running the default vanilla WPF project from Visual Studio.