Preferred width/height warning

[Mike Martin <redtux1 gmail com>]

I am trying to eliminate this warning ie:

(membership_gui.pl:4729): Gtk-WARNING **: Allocating size to GtkWindow
0x44d4260 without calling gtk_widget_get_preferred_width/height(). How does
the code know the size to allocate?

(membership_gui.pl:4729): Gtk-WARNING **: Allocating size to GtkWindow
0x44d4260 without calling gtk_widget_get_preferred_width/height(). How does
the code know the size to allocate?

(membership_gui.pl:4729): Gtk-WARNING **: Allocating size to GtkWindow
0x44d4260 without calling gtk_widget_get_preferred_width/height(). How does
the code know the size to allocate?

This happens in the following scenario

Notebook containing gtkgrid, which contains gtkScrolledWindow containg
GtkScrolledWindow

If I run a different sub-routine, which doesn't have a treeview/scrolled
window first the message does not appear
Gtk version 3.22

Any ideas