auto resize component in main window when main windows is resized

[jirach_gag]

Dear all, I know this is kind of newbie question. But I tried to search forum but can not find the solution. Below is the capture of my main windows.



Basically the left hand side is a label(please select file....) and right hand side is a tab. When user use this application and change the size I want the label to expand horizontally and vertically to fit the screen. And the tab to expand vertically. Can anyone suggest me how to do that ??

And if possible, can I hide the tab first and when people move the mouse near it then show it ( like a windows autohide task bar ) ???

thank in advance