>>>I don't want to change grid recordsource. I want only to add new columns to grid. Currently I use the below. I read your article but haven't found any hind how to change this code.
>>>I found that C5 error occurs ONLY if grid contains combobox. If grid contians only textboxes, c5 error does't occur.
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>>Just an idea, and you may not like it, but IMO grid rebuilding is time consuming and tricky process. Why don't you have three or four grids and keep all but one hidden? Show the one you need at any particular moment. Even if you build them on the fly, build them only once. Have a reference of each of the grids in their container's (form, page, whatever) array property (take care at .destroy, but you know that). At least when switching between grids you wouldn have them flip almost instantaneously.
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>My customers require that they can yourself add columns to grids.
>Currently this can be done simply by adding rows to grid description table.
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>Using youre recommendation, they must by VFP and learn programming.
>Is'nt it a bit difficult ?

Actually no - each time you take a new selection from this grid description table, build a new grid in a new container. You can class the container to have all the code you need. Hide other containers and show the new one. In other words, if destrozing columns won't work, just hide the previous grid and build a new one.