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From: wilcox@wucs1.wustl.edu (Don Wilcox)
Newsgroups: comp.sys.mac.programmer
Subject: Control Manager question.
Message-ID: <1990Jul6.135203.1164@cec1.wustl.edu>
Date: 6 Jul 90 13:52:03 GMT
Sender: news@cec2 (USENET News System)
Reply-To: wilcox@wucs1.wustl.edu (Don Wilcox)
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Organization: Washington University, St. Louis MO
Lines: 16

We have been trying to implement a control which behaves much like the standard
scroll bar, except that the size of the thumb can be changed.  The new control
looks much like a scroll bar, with an additional pair of icons which are used
to widen and narrow the thumb.

Unfortunately, we cannot get it to work.  We can display the control, and change
the values of the various parameters using SetCtlValue, etc.  However, when our
application calls _TrackControl with action proc -1L, the control defproc is
never sent message autoTrack.  BTW, we are correctly setting contrlAction to
-1L in the initialization section.  We have tried everything we can come up
with, and cannot get it to work.  If anyone understands this post and can be of
any help, we would be very grateful.

Don

I am rarely capable of expressing my own opinions...