GUI Editor: adding other subcomponents?


#1

Can I somehow add other Subcomponents to a GUI component via the GUI editor which are not listed in the GUI editors right click menu ? Say a File Browser Component, which seems to be missing there ?

edit:
Sorry, I figured this question makes no sense for a File Browser Component. because a file browser opens its own window and would be invoked by a button for example.

But how about custom GUI components ?