Can a GtkHandleBox be made transient?

[Michael Wybrow <mjwybrow cs mu OZ AU>]

Hi, I sent this message to the users list yesterday, but I'm actually 
thinking it's more a question for the GTK+ developers.

---------- Forwarded message ----------

I'm looking for a way to make a GtkHandleBox in its torn-off form a transient 
window.  For inkscape we use GtkHandleBoxes for our toolbars. The fact that 
they are non-transient causes several problems.  For example, they can easily 
sink under the document on Linux and stay above everything (even other 
applications) on OS X.

Is there any reason that windows created by GtkHandleBox aren't transient by 
default?  This is the behaviour I would expect.

Is there a simple way to make them transient?


Thanks,
Michael