Maximize dialog, buttons don't remain in same location..

[jminnie]

How can I set all buttons, text, etc.. to remain let's say top center of my dialog regardless of whether the dialog is a window or maximized? Currently, as soon as the window is maximized, the main dialog window itself goes full screen, but all the contents of the dialog (buttons, text, etc..) remain there original size and reposition to the top left leaving the whole right and bottom empty.
*Also, if I have a jpg image as the background, is there a way to stretch that image if the window is maximized? So it looks the same regardless of the window size?

Thanks
Jason