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How disable a node of a Extjs 6.0.0. treelist?

I'm using sencha extjs 6.0.0 . I have a treelist like here . I want to some of its leaf be disable.

Is it possible ? If true, how?

According to doc, the nodes of the tree don't have "disabled" property. Here is another thread discuting the same problem for ExtJS 4, solving it with some CSS :

Is there any way to disable nodes of treeview in ExtJS 4

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