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Only one node within a parent can be expanded at the same time

Hello,
It is possible that Only one node within a parent can be expanded at the same time

Thank you

Can be achieved through onOpenStart event
In case of dhtmlxtree it will look as

tree.attachEvent("onOpenStart",function(id,state){
      if (state==-1) //opening
            tree.closeAllItems(0); //close all other branches
      return true;
})