Costas,
While I was developing my MAPI object all I had to do was dismiss the read-only messagebox and could then carry on with what I was trying to do. Maybe it's an issue of prop sheet placement. I run at 1280x1024 and keep the prop sheet to the right side of the screen and always fully visible because the form/class designer is in the upper left corner. Maybe if you just click one of the tabs on the prop sheet it'll repaint for you.
>I just figured it out how to do it. I first click on the BaseClass of the Form's property sheet and then click on MAPI controls to get the corresponding property sheet. That seems to work. Obviously this is a bug in VFP.