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fires right after a tree item has been double clicked, but before the default onDblClick functionality has been processed

boolean onDblClick ( string|number id );
id string|number id of the node that was double clicked
boolean true - confirms opening/closing

Example

myTree.attachEvent("onDblClick", function(id){
    // your code here
    return true;
});
Details

The event is blockable. Returning "false" will prevent the default action.