Layout Composite Widget Components Using Glade-3? / Pluggable widgets replacement for Glade custom widget?

[Daniel Yek <dyek real com>]

Hi,

I have been wondering, if I were to create a (custom) composite widget 
to contain several standard GTK+ widgets from within a larger Glade 
project, is there a way I can keep both the application layout and the 
composite widget layout in the same Glade-3 project? (It is nicer if all 
widgets appear in the same design view.)

Do I have to use the custom widget in Glade (which is marked as 
deprecated) to create composite widget? Is pluggable widget the 
replacement mechanism for custom widget?

I read a little about pluggable widgets, but I'm not familiar with 
creating pluggable widgets and I am likely not able to spend time on 
that. How much additional time is needed to turn a custom widget into a 
pluggable widget? Is there a generic mechanism that automatically turn a 
custom widget into a pluggable widget where it might be possible? :-)

I'm just trying to figure out how to best create and use composite 
widgets. Ideas and advice are appreciated. Thanks.

--
Daniel Yek.