Maya draggerContext holdCommand is not working

maya
python

#1

All commands in script bellow are working (prints according text) except one. Holding is not working.
If I understand right print(‘holding’) should work in case when I press and hold the button.
What I do wrong?
Please help

import maya.cmds as cmds
def onPress():
    print('pressed')
   
def onRelease():
    print('released')
    
def onHold():
    print('holding')
    
def onDrag():
    print('dragging')

# delete drag if exists    
if (cmds.draggerContext('drag', exists=True)):
cmds.deleteUI('drag')
cmds.draggerContext('drag', releaseCommand='onRelease()', dragCommand='onDrag()', pressCommand='onPress()', holdCommand='onHold()', cursor='hand');
cmds.setToolTo('drag')