This [Tk] command was added due to [TIP]#324 [http://tip.tcl.tk/324]

[ZB] What do you think about moving "OK" and "Cancel" buttons down, and place them horizontally, under "Effect"/"Sample" frames? Currently there's a whole lot of empty space on the right, due to buttons position.
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%| [Category Command] | [Category Widget] |%
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