>Hi Christof,
>I now tried with other graphic atabtors. The problem is reproducable.
>My testform has a label with the strange behavior, a textbox
>and a command buttom with the following code in the click event:
>thisform.lockscreen=.T.
>thisform.refresh
>thisform.lockscreen=.F.
>after several refreshes the caption of the label fades out. When the textbox is removed, the appearance of the label does not change. The problem occurs with textboxes,grids (also empty grids with columncount -1),checkboxes no matter if disabled or enabled. Seems to me like a bug!

I created a form like you described on my machine, and could not reproduce the problem. Is there any other code for the controls? Are you testing with base class controls?