>>>Hi,
>>>
>>>I have a form with a grid in the left side of the form. The grid is data driven (that is created when the form is instantiated).
>>>What happens is when a user resized the form to such small size that the left-side grid is just a line (or maybe two vertical lines), the run-time error occurs:
>>>

>>>Error with left_pane_grid - width : Expression evaluates to an illegal value
>>>

>>>
>>>How do you suggest to prevent this problem?
>>>
>>>UPDATE. There is a custom (my) code in the method RESIZE. The code in this methods set the .Width of the grid.
>>>I need to "catch" it before it gets too small.
>>
>>Check MinWidth in Help...!
>
>It looks like this property (in Help) is only applied to form or _screen. When I view all the properties of the grid, I don't see this property.

That's correct, it applies to the form. Seems like exactly what you are looking for? Just set it to a value that's big enough to avoid the error.

Having said that, have you considered using anchors for all the objects? That's the modern way to do it.