Thanks Bernie,
After reading your response I tried my macro again and discovered you
were right: The toolbar width was automatically adjusting to the
caption. What had fooled me was the fact that the toolbar was coming
out a little wider than neccessary, causing extra space after the
caption. I fooled around some more and took care of this problem by
removing the following line of code:

.Controls.Add Type:=msoControlButton

Thanks for helping lead me to this fix.

Mark