>If I want to center my label programmatically, how can I do that. I set the value of caption at run-time.
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>So I do something like thisform.label1.left=(thisform.width-thisform.label1.width)/2
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>But this won't center the label. Any help?

That should center the label, but if the text in the label is shorter than the label itself, it would be, well, to the left of the center if the label is left justified.
Set the label's .alignment=2 (centered) in addition to your centering it. It should look right then.

BTW, you don't have to calculate the position - this should be possible at design time by a button in the Layout toolbar, there is one to center the control horizontally.