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See link below. This tutorial helped me find the solution. If you are having the same issue I was, you will probably be using the 3rd option to get the desired results.
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I was having this issue with eclipse, the programming IDE. I would install the program, but I was unable to add it to the Favorites dock.
The solution that worked for me was creating a .desktop...

+1...I was looking for this in the dconf, and the tweak-tool,but could not find the setting!