I'm working on an EaselJS program that continually draws thousands of vectors. Needless to say, after a short amount of time, performance drops. To solve this in Flash, I would have created a Bitmap behind the vectors and periodically draw the vectors to that Bitmap and remove them from the display list. 

I'm having trouble doing this in EaselJS, even though it seems like all the pieces are in place. How can I create an empty Bitmap() and draw the contents of my Container() to it?