title: Automatically check/uncheck all subtree nodes in extjs tree when certain node gets checked/unckecked
body: <p>How do I automatically check/uncheck all subtree nodes in an extjs tree when a certain node gets checked/unckecked. I already have my tree with checkboxes. The only thing missing is this check/unckeck behavior. I found this: <a href="https://stackoverflow.com/questions/2271177/check-child-nodes-of-a-tree-when-a-parent-is-clicked-extjs">check child nodes of a tree when a parent is clicked [ExtJS]</a> , but it doesn't work for me because the the extjs API seems to be changed.</p>