>
>DEFINE WINDOW ChildWindow IN WINDOW (thisform.Name)

Zoom window ChildWindow max
Activate window ChildWindow

>MODI FILE (lcMsgFile) Window ChildWindow IN (thisform.Name)
rele wind childwindow

The Zoom and Activate force it to fill the form's window. I thought Zoom will be enough, but... Also, not sure of the order in which these need to be issued. Glad you came up with this - I needed it this morning, and I'm in no rush :).