Element: tree_window.context_node
Element: tree_window.context_nodetreenode
The node under the mouse when a right mouse click is executed in tree_window. This will be null if the mouse is not over a node (its label or its icon).
It is maintained by the system, and its value cannot be changed directly.
Its value is typically used within a tree window .exec callback. See here for an example of its use within a .exec