>I need to change sorting of records when user clicks on a column header of a grid. As far as I know how to do it, you have to replace "Header1" from the column object and replace it with your own custom object. The problem I am having is that it works when grid has no columns and you build it from "scratch."
>
>But I am trying to make it work on an existing grid (that is, grid build in the designer). So when I run the following code in the INIT method of the form:
>
>

>for each loColumn in thisform.grid.columns
>	loColumn.RemoveObject( "Header1" )
>	loColumn.AddObject( "Header1", "custom_header" )
>endfor
>

>
>I get error on the line .AddObject. I am using VFP 6.
>
>Does VFP 8 grid have functionality that would allow me to make this work on an existing grid (that is, without having to build grid in the INIT method)?

It would help if you said which error are you getting. I don't remember whether I've done that in 6, or started with 7, but I think you don't need the removeobject line. If you watch it in the debugger, the moment you remove the header, a new one is inserted instead of it. But when you add a header, the old one is automatically removed.

This exceptional behavior of columns with headers is quite opposite from what it does with other controls - you can add them as you like, and if you want your control to be the one, you need to add it first, then remove the original one. If you remove the old one first, it's reincarnated (well, just like it does with the header - sometimes I think VFP grids come from those horror movies where the monster just keeps getting revived, really hard to kill).