>This code, which is called by a button,
>

>for each oControl in thisform.Controls
>	if oControl.class = "Mergeclass"
>		thisform.RemoveObject(oControl.name)
>	endif
>endfor		
>

>Leaves 1 instance of the target class remaining on the form. Any ideas why?
>I thought maybe it was a focus issue but focus is switched to the button when it is clicked.

I had fallen into the same trap few months ago, so I now I know that you can not remove an object from a collection using FOR EACH syntax. You need to use a counter and go in reverse order to remove items.