Problem using Bezier Curve Tool with iWork6

I am facing a problem with Keynote and Pages from iWork 6. I am having problem using the manual shape tool such as Bezier curve. For adjusting the points on curve, I have to reduce the control points of the curve. But sometimes the tabs are getting too close and flip off to out of the page and the program gets hang. Please let me know, if anybody already experienced the same thing and found the solution. Please help me to get out of this problem. Thanks in advance for all the support.
