b02 promotion of Franca.
According to the API: focusable attribute of the Node specifies whether this Node should accept input focus. Even if this is true, it is possible that the Node will not receive focus. For example, a node may be focusable, but visible is false and thus it cannot receive focus. Focusable is simply a way for the application to indicate that a specific node may be allowed to be focused. Nodes that don't want input focus should set this variable to false.

If you set focusable attribute of the Node to false it will accept the mouse input.