How to create a toggle button that shows/hides a smartshape?

Hi,

I'm working in Captivate 6 and would like to create a button (could be a smartshape button, say smartshape A), that On Click, shows another smartshape B. When you click this (SmartShape A) button again, it hides SmartShape B -- so basically it toggles the visibility of SmartShape B. How would i do this in Captivate?

Thanks,

Sean