I am working on a Cocoa application. In Interface Builder 3.0 I drug a number of slider controls into the window and embedded them into an NSMatrix. When I then go to File | Simulate Interface I can't manipulate the sliders. I click on the sliders and try to move them but nothing happens. If I do the same thing but don't embed the sliders in an NSMatrix I can simulate the interface and manipulate the sliders just fine. The same behavior occurs if I create a little test application and try to use sliders embedded in an NSMatrix. Does anyone know the proper way to embed a number of slider controls in an NSMatrix and have the sliders be selectable and able to be manipulated?