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Please Answer following quetion so that i can go for license purchase. 1: As Soon as some node is expanded how can i select the expanded node so that when i do tree.getSelectedItemId() it should return me id of the node which has been expanded. 2. As soon as some node is Squeezed its parent node should be selected so that tree.getSelectedItemId() should return parent of squezzed node. 3. which function is actually called when a node is expanded/squeezed.

in case of dhtmlxTreeGrid you can attach an event which will fire on expanding/collapsing nose
    grid.setOnOpenStartHandler(function(id){
       //any custom code here
    });

to autoselect on open you can use

    grid.setOnOpenStartHandler(function(id){
       grid.setSelectedRow(id);
    });

this will work for both expanding|collapsing

>>which function is actually called
There is no hardcoded functions, but you can use described approach to attach any custom reactions on node expanding|collapsing

In case of dhtmlxTree - approach is the same, but the names slightly different

tree.attachEvent("onOpenStart",function(id){
    //any custom code here
});

for auto selection

tree.attachEvent("onOpenStart",function(id){
    tree.selectItem(itemId);
});