How do I free a PixMap from memory?

BlitzMax Forums/BlitzMax Beginners Area/How do I free a PixMap from memory?

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I want to load a PixMap, retrieve some colors and than delete it.
It sounds so simple to do, but I have no clue.
"Release"? (has something to do with an integer)
"flushmem"? (Identifier flushmem not found)
"AAARG" (help is apreciated)