Alright, I've modified my script so that it uses the CardLayout, which works fine. Now the problem STILL remains, the TabPanel's deferredRender functions doesn't do anything for me.
I dynamically ADD a component to the CardLayout when a item in the menu is clicked.
The FormPanel encapsualtes the xtype'd 'tabpanel' with a deferredRender: false config included. Now, getting the FORMPANEL by it's ID like so:
Give's me the only FORM on the activated TAB, so I need to physically CLICK every single tab to fetch ALL forms. How can I fix this? :/
A short snip of the ITEMS inside the FormPanel:
// ... More fields here
// And about 4 tabs here