I've been struck with a dilemma. A certain RadWindow contains a RadTabControl, that has a Tab with RadCartesianCharts and a WebBrowser on it. I discovered that the web browser wasn't able to show when we changed all Windows into RadWindows, and the solution would be to use the RadWindowInteropHelper to set the transparency to false. This solved the WebBrowser's issue and now it displays, but suddenly the colored bars on the charts don't appear, so it seems the transparency was necessary for them. I'm not sure if there's a way for me to have both appear or if I'll need to make changes to how the application should work.