In my application I want to have 2 horizontally resizable panels of which 1 also has 2 vertically resizable panels. Having either a horizontally resizable container with 2 panels and a button OR a vertically resizable container with 2 panels and a button works like a charm. Once I start using both at once only the nested vertically resizable panels in a container still work, the horizontal one doesn't allow resizing at all. Is there a way to get this working? Schematically it looks like this:

P11   |
----- |   P2
P12   |