How do i create a Class that can control the main stage in action script

I am developing an application with many complicated sections, what i would like to do is have each section or panel govern the main stage as if its the main class, and when i am finished or change to another section, all the items will be removed from the stage and the new class will load its objects and material onto the stage in turn..

what i need to know is how i lut a class take charge of the main stage