...In Style window, could be possible a slider "[<-- -->]" in the color box to can change the Opacity of a shape directly in the color box without have to open the Color Picker window? I want say, only a slider inside the box that you can drag gradually left (to transparece) and right (to opaque), I think that it seems simple and it'd be easy and good for save a lot of time, over all when we must make Visible/Invisible a shape to ocultate or show it... Well, I hope that this like you! CIAO!