Hello, I have no success trying to show a screen mask during a PromptCallBack.   After reading a value with the Prompt dialog, I need do some "heavy" work on DB, so the necessity of a showmask.   I used the model:   MainForm.ShowMask('Processing...');   UniSession.Synchronize();                    // in MainModule is   EnableSynchronousOperations := True   ... "do long job"...   MainForm.HideMask; But nothing happens...   The prompt and callback are used in a TUniFrame, not a form, b