Primitive objects can be active (except Line).
Rectangle
It can be filled, with a border (Line), without a border (None), or using a windows border – raised or sunken.
Circle
Uses the same properties as the rectangle object.
Polygon
With this version of MMB the polygon has very limited functionality, However, from MMB4.9.5 it can be resized and it can have a different fill and border, or no border at all.
Line
Line is an inactive object. It cannot have an action.
You can make this object interactive by inserting some actions.
For more info, see the Actions.
Tip: Nice multimedia applications can be created just by using the primitive objects and text!