onOpenStart

fires at the moment when the "plus" icon is clicked in treegrid

id	string|number	the id of the related tree-item
state	number	the current item state, 1 if item is currently opened

boolean

true - confirms opening/closing, false - denies opening/closing

Example

treegrid.attachEvent("onOpenStart", function(){
  //custom code here
  return true;
});

Fires before real item opening, also fires for item closing.

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