>>>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.
>>
>
>The error is "Object Name is Invalid", when trying to add object "custom_header."

Try naming your new header anything else but Header1. You may change its .name in the next line if you want, but in the line where you're adding it, it needs a different name.