Add ability for graphics drawn on maps to be transparent

Idea created by IMohamed-esristaff Employee on Mar 19, 2010
    Implemented
    Score6420

    This is requested quite frequently so that graphics, especially rectangles and polygons, drawn on maps can support transparency. For example, I want to draw a graphic on the map and be able to see through it to the map underneath. Using no fill or hatches doesn't work as nicely for this because when you zoom in very closely you may not be able to tell if you are inside or outside the area. Or I may want to draw a text callout and have the callout box transparent.