Note: At this point in time, you can only decrease the size of containers as the visible slots for each item is handled client-side. However, there is a method I am slowly working on to make it so you can increase the number of visible slots for certain containers.

 

You can use as example:

container.panelName = "genericlarge";

Search for another panel names :P

Oh awesome, I wasn't aware that they updated this to not be strictly client side. I'll change this when I get a chance