i *think* the OP wants to build a border layout upon tabclick inside of that tab.
Yes! This is my initial question. I look the wiki, read examples, search forum, googling,... and after post my question in this forum. Sorry. But no one give me a working example with more than one tab.
A promise: when then application will be right I post the example in the wiki.
I'm still not understanding what you want to do enough to make a more educated suggestion.
Will you have a fixed / set number of tabs only? For instance will you always have the same number of N tabs?
How many tabs will you have if already known?
Do you want the content inside each tab to be lazy loaded?
For the purposes of your example, I would think you should leave the tree and grid out for the moment. Just load static random text into your west and center region. That way you just figure out how to get the operation of your application working. Then later start adding in the complexities of widgets inside your tab (grid, tree, etc.).
I'm of the opinion the example I pointed you to dynamic tabs and advanced dynamic tabs would be good base starting points. Once you have that operation working like you want then you pretty much add in your tree/grid code that you have now.