How many tree’s or object’s can be stacked before there is an issue?
Can you give me an idea of what you are trying to do?
if you are referring to using the tree view component to control other tree view components, sure, you can do this, but you will need to do it through scripting.
I guess am asking how many physical trees can be stacked on top of one another on a window without causing issues?
You shouldn’t run into any kind of issue doing this.