I thought initially that the problem with FullPage property is only when setting it at design time.
I thought it works OK if you set it during run-time but I am wrong.
http://www.opcodeservices.com/TestWebApp/WebForm11.aspx
It's the same code from FullScreen example which comes with the demo
I only changed the event from the 'Show HTML' Button to make the editor go full screen.
As you can see, clicking the button makes the editor go full screen and work correctly in IE when resizing the window and switching tabs.
On Firefox and Chome however, it doesn't.
What's weird is that it starts working as soon as you do a switch by using F12.
So there's something in the code on pressing full screen shortcut which makes the editor work correctly.
I really need this done as soon as possible because I already lost incredibly a lot of time for this issue
I need to develop a proof of concept which proves your solution works in our scenario, in order to buy your solution.
THanks!