The mouse has left the bounds of the control
Member of Control (PRIM_CTRL)
MouseLeave is fired when the mouse leaves the outer bounds of a control. It is not fired on the parent when the mouse enters the bounds of a child control. Most MouseEnter/MouseLeave requirements, such as setting the cursor or Style, can be better managed through the use of other more automated features such as the MouseOverStyle property.
LANSA Version 15, April 2020