how to hide knob using tcl

Hi, can anyone help me , how to hide knob using tcl (without involving python)? i found this code :

Code:

knob [group_knob] 0


but this is not i want, this script only hiding the knob inside the collapsed group_knob. So i want to be able to hide it like python .setVisible() does. Is it possible using pure TCL ?

thanx.

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