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dhtmlx Tree

How to know the tree has been loaded completely.. is there any event fired. after the loadXML statement i want to know the no of children in that tree

There are two ways to detect moment , when data loaded in tree

a) onXLE event
   tree.attachEvent("onXLE",function(){
       //will be called after any xml loaded
    });

or

b) second parameter of  loadXML command
    tree.loadXML("some.url",function(){
       //will be called after data loaded in grid
    })