How center a small button horizontally like in this picture....

[Christian Seberino <seberino spawar navy mil>]

I want a button to be centered horizontally in a vbox like this:


 ----------------------
|       ------         |<--- vbox
|      |Button|        |
|       ------         |
 ----------------------


Notice empty space above, below and to right and left.

How do this????

I created a hbox and packed a text label of whitespace
before adding button in order to move it to right
but this is not a good solution.

Any ideas?

Chris
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