middle button so a portable application should avoid relying on the events from
it.
-{\bf NB:} Note that under Windows mouse enter and leave events are not natively supported
+{\bf NB:} Note that under Windows CE mouse enter and leave events are not natively supported
by the system but are generated by wxWidgets itself. This has several
drawbacks: the LEAVE\_WINDOW event might be received some time after the mouse
left the window and the state variables for it may have changed during this