Treepanel Disable tree only - leave other elements active
I'm trying to disable (mask - grey out) the *body* area of a treepanel and leave all other elements (toolbar, etc) of the tree panel still active.
I tried using something like treepanel.getRootNode().disable() but it doesn't seem to have any affect.
The element i wish to disable appears to be the class 'x-panel-body' where the tree nodes are rendered. I can see the element id but am stumped as to how to obtain this info from within Extjs to disable it ...