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Tree: Clear an event

Hi,
I wonder if there is any way to clear an event? attachEvent(event, null) does not override the existing setting, it just adds a new one.
Thanks

Each event can be detached in next way

var eventId = grid.attachEvent(....);   //attach event return event's ID
.... some other commands.....
grid.detachEvent(eventId);   // event can be detached by its ID