Logic Pro 8 Start point

Hey Guys, I want to change the start point of a tune. I can easily set the end buy just dragging the marker where I want, but it won't allow me to do the same for the beginning of the tune. ???? I have gotten around this buy using the cycle control when bouncing, but I'm sure there's a "right" way to do this. :confused:
Logic has always had the ability to drag the starting bar just as you have dragged the end. You can start at bar 0 or negative bar numbers if you want. Is this not true in your case?

Yes this in not true in my case. The question is not how, rather why it isn't allowing me to do it. It works on other tunes I have done, but not this one. Could it be something I have inadvertently disabled?