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From: beau1029@mstr.hgc.edu (donald beaudry)
Newsgroups: comp.windows.x.motif
Subject: Re: form dialog resizes itself when I change a button label.
Message-ID: <1991Jun26.044727.26088@mstr.hgc.edu>
Date: 26 Jun 91 04:47:27 GMT
References: <1991Jun20.015841.7418@porthos.cc.bellcore.com>
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Here the possible solution:  the label widget and gadget classes contain 
an XmNrecomputeSize resource.  Set this resize to false.

If you still don't get the desired result, set the button's labelString to
the longest possible value when you create it, and then do a SetValues to
set the recomputeSize resource to false.