Layer vs Dialog

Some days ago one my friend showed me nice approach for creating dialog, maybe it was nice only for me but I think many of Lotus Motes developers never thought about this approach before. As usual I used form/subform to create UI of my future dialog and then show it using @dialogbox or notesuiworkspace, but in this approach we lay layer onto our main form from which we will show a dialog. One of the main advantage of this approach is that we can change window in Lotus Notes during working in dialog.