On Fri, 31 May 2019 11:41:23 GMT, Ron Tarrant wrote:

(treeviewdynamicfillwithscrolledwindow.exe:10124): Gtk-WARNING **: Allocating size to GtkWindow 0000015ae0d2ae40 without calling gtkwidgetgetpreferred_width/height(). How does the code know the size to allocate?

New info...

I tried doing getPreferredWidth/Height for the Window, the Box, the ScrolledWindow, and the TreeView. Except for the Window, they all report '0' and '0' for minimum and natural. The Window reported '200' and '200,' but making these calls before the setSizeRequest() call made no difference. The error still showed up.