extjs4 tree check all children

we use extjs treePanel with checkbox. here's the problem and solution.
If we select the parent node then the child nodes under that parent are selecting. 
checkchange : function(node,check){
     node.cascadeBy(function(child){
         child.set("checked",check);
     });
 }
=============
check/uncheck all node:

Ext.getCmp('myTreePanel').getRootNode().cascade(function(n){
	n.set("checked",false);
});
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