Rich,
You might want to try using the Moved event of the column.
[Update]
I just did a crude test and it seems to work, but you will need to use a custom class column or repeat some code.
For testing I put in the init of the column:
this.AddProperty('lMoved', .f.)
<pre>
in the Moved event of the column
<pre>
this.lMoved = .t.and in the click of the header
if not this.Parent.lMoved
wait window 'Click!' nowait
endif
this.parent.lMoved = .f.
So, it needs refining, but it should work
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