[Description] Gets the lookup key name of a visual in a resource dictionary; the visual is to be used as the source for the brush. [Method] 
GetVisualLookup
C l o n e
G e t V i s u a l
G e t V i s u a l L o c a l
G e t V i s u a l L o o k u p
S e t V i s u a l L o c a l
S e t V i s u a l L o o k u p