$('#cc').combotree({
            	   onChange: function(newVal, oldVal){
                     var t = $('#cc').combotree('tree');
                     var f = t.tree('find',newVal); 
                     var s = t.tree('find',oldVal); 
                     var m = t.tree('getChildren',f.target)
                     if (m.length > 0) {
                       alert('Parent');
                       t.tree('select',s.target);
                       alert('Select');
                       $('#cc').combotree('setValue',oldVal);
                       alert('SetValue');
                     };
                   alert('Exit');
  	        }
                });