In the code bellow, redButtonPressed and shiftPressed are detected correctly. However if I replace the #shiftPressed message by #controlKeyPressed message the redButtonPressed and Control key can not be detected *at the same time* Indeed, if I remove the redButtonPressed test, ControlKeyPressed is detected. All in all, it looks like redButtonPressed and ControlKeyPressed cannot be captured at the same time. I am under Linux VM. Is it an known problem? Hilaire mouseMove: evt (evt redButtonPressed and: [evt shiftPressed]) ifTrue: [...]. -- Education 0.2 -- http://blog.ofset.org/hilaire