Show desktop exclusion

The show desktop thing in the right-bottom corner of my screen is great. I'm using it very often.
The only thing I want to do with it, is to add an 'exclusion'. I'm running Rocketdock (Something that looks like Mac OS it's Dock), but that is also seen as a 'window'. It's minimized once I hit the desktop button, and I don't want that. How can I keep that window being shown once I hit the button?

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