How to replace the Swing Container in the TopComponent with a Frame?

Hi Everyone,

I'm working in a project which is composed by several tabs and all of them have been created extending TopComponent and setting editor as mode. 

Actually I'm working on a tab which should show the screen of a Virtual Machine (this one is running on VirtualBox). To reach this goal I'm using the open source project properJavaRDP. The problem is: this project is quite old, it uses as top level container a Frame from java.awt and if I extend the TopComponent class, it already includes a top level container from Swing. How can I include this Frame inside my component?

Inside the frame is included a Canvas. For some reasons I have to use the class RDesktopFrame (which extends Frame) of the project, and I can't include the Canvas inside a JInternalFrame (just for example).
Even if I've already searched information in the web, I didn't find anything so far. 

Thanks in advance!