I test the code also, I notice sometime the [toControl] is not an object(show as .F. in the debugger), to overcome the problem, I just add some code to detect when [toControl] is not an object, then just don't run those resize code, see the example below.

Hmmm. This is very interesting because the code that I posted was from a class in an old production application and the client has never complained of a problem. I just re-tested with a form that contained a pageframe with 2 pages, an option group, a combo box, a list box, a command group, a command button and 2 grids. The code worked flawlessly.

Did you have something else on your form that is not in the list above?