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The problem that I'm running into, is that on the tree, checking the root selects everything underneath, and checking the parent selects everything under it. (as it should) However, no code exists to handle these two instances. There is, however, code to handle the child nodes.

My question is:

The tree doesn't support such behaviour, but you can use one of next two workarounds:

 a) Define top level checkboxes as disabled (disableCheckbox method, or "disabled" attribute in XML)

 b) Create custom onCheck handler

tree.enableThreeStateCheckboxes(false);

tree.setOnCheckHandler(function(id,state){

                if(!tree.hasChildren(id)){

                               tree.enableThreeStateCheckboxes(true);

                               var item=tree._globalIdStorageFind(tree.getParentId(id));

                               tree._correctCheckStates(item,state);

                               tree.enableThreeStateCheckboxes(false);

                               }

                else tree.setCheck(id,!state);

});

Not much can be said in addition to the reply above, but you also can check gent chart and datagrid edit and find out what we have probably missed in our explanation.