You can achieve the desired scenario by placing an ASP Image control with the main content of every RadDock on your page. When a dock control is moved inside and outside the RadRotator, you can use the OnClientDockPositionChanged
event handler in order to check the control's position and according to it to show/hide the main content or the image. You can find attached a sample project, implementing this solution. Please use it as a reference to incorporate this feature into your actual project.
I noticed that the presented scenario is the same as the one, reported in another support ticket. For future use of our support system, please use a separate ticket for every problem. This will lead to easier to follow conversation and we'll be able to provide assistance much faster. I would suggest continuing the discussion in the initial support ticket on the matter.
All the best,
the Telerik team
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