gtk_widget_size_allocate doesn't seem to change the size of my widgets in a GtkFixed container

[jason harlequin co uk (Jason Trenouth)]

Hi,

I've got a bunch of widgets in a GtkFixed container and I'm trying to set
their sizes and positions using gtk_widget_size_allocate but it has no visual
effect and if I query the sizes using gtk_widget_size_request then they don't
appear to have changed. What am I doing wrong? :-(

__Jason