Trouble with GtkPaned

["Larry Kastel" <larry kastel flextrade com>]

I'm placing a GtkHPaned inside a GtkHbox, which is inside a GtkWindow.
(Nothing else is in the Hbox)

 

If I make the window wider while the app is running, I cannot make the left
pane wider than the original width of the window; the divider cannot be
dragged further to the right.

 

I've tried this with the Hbox, and I've tried placing the GtkPaned directly
into the window using gtk_container_add, with the same result.

 

Is there any way to make this work?