>This one is for VFP7, but answers that require VFP9 are also welcome.
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>Is there any way to ' replace' the headers in a grid in a form with a custom header? I'm not talking about code generated forms and grids. I'm tallking about the form designer where a grid is added and the number of columns is still unknown.
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>(Brings me on an idea: Create a grid class that has 10 columns and each header got the same custom code. Setting columncount to a lower value later is just another way than making it higher than -1. But this scenario might become a nightmare scenario because any maintenance would require 10 equal modifications in 10 places.)

Yes, you can use a builder or you can use MemberClass (VFP8+) to replace column class with custom column class.

Header class needs to be defined in a prg (since header and column are both non visual classes). You can find a sample in Downloads section here - sortable grid by Vlad G.