add a button while running and how u use a treeview

[high6]

ok i got 2 questions... how do u add a button while the program is running, like for example u hit a button and it creates another 1.

second how do u use a treeview i wanna do this.

add a node then a node in the node so it looks like

we
|
-we2
+we3
so when we is opened it shows we2