Filling a Polygon in OpenOffice Draw

OK, I've created a polygon (e.g. grouped three lines to become a triangle). Now I want to fill the area inside. If it is a square or circle created using those specific tools, it's easy. But selecting my newly created polygon, right clicking and selecting "Area" has no effect. Am I doing this wrong, is this unsupported functionality, or is this a bug. If it's a bug, it seems like a fairly obvious one.