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Hi guys!
Till now, I've been using grid only in basic range.
Now, I want to advance it, but I can't find, how works ColumnWhen, ColumnValid, OnQueryData.

I've read all examples, but they are so trivial.

Could sb. write about these events?
Many thanks, Marek

A nice example for ColumnWhen and ColumnValid would be "Xtract" where in I have used both in main.prg (Line no. 138 onwards).

Thanks, Rathi!