>In one of my form containing a grid, whenever I start the form, I see the grid's controls refreshing which is kinda annoying. I found that this is coming from the form refresh method. I don't have anything code in my baseform refresh method. Is there something I can put in order to lock the screen when this method is processing?

You mean that you don't do thisform.refresh anywhere?
Maybe you can try to use NODEFAULT conditionally in grid.refresh() ?