Update AutoCAD behind modal form

Hello,

please imagine a modal form. I change something and the result shall be shown in the current space of AutoCAD. Unfortunately, the current view won't be updated immediately.
That's why I send an additional (vla-update (vlax-get-acad-object)). But this is not really good for performance. What do others do in this case?

Fred

I think the very nature of a Modal form has complete focus. If I need updating while a form is open, I will use a modeless.