Note: This only works with symbols or other grouped objects. If you draw ordinary fills or lines on top of each other on the same layer, the new lines/fills will completely replace the old ones.
By Adrien-Luc Sanders, About.com
Note: This only works with symbols or other grouped objects. If you draw ordinary fills or lines on top of each other on the same layer, the new lines/fills will completely replace the old ones.
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