onMouseExit() not working

I have been learning how to use onMouseOver and onMouseExit, but it turns out onMouseExit does not work as I want. The “Out” would never be printed. Does anybody know why?108733-onmouseexit.png

Method names in C# / .NET start with a capital letter. Also method names are case sensitive like in most programming languages. So onMouseExit is not the same as OnMouseExit