[E-devel] how to give focus on the swallow part

[flower-mei <flo...@16...>]

 hi all,

   If  I want to receive signal from the main group, I can set 
   self.main_group.focus=True
   thus, we can only  receive signal from the whole swallow part but  can't recognize which  special part?
   how can I set the focus to the swallow part so that it can receive  signal from the part in the swallow part?

 Thanks!