I have a question about Swing development.  I've ran the tutorial for
Eclipse's VE and read http://java.sun.com/docs/books/tutorial/uiswing/layout/visual.html

Now, depending on which layout manager I use, my components (like a
JButton for example) take the size of their container.  When using
gridbag layout with Eclipse VE,I can never explicitly position that
Jbutton.  It gets put at 0,0 or 0,1 for example, but I can never
really control exactly where the component goes.  If the frame gets
resized, then that's a whole other set of issues to solve.

I have seen some really nice Swing UIs out there - buttons that stay
in the same place, keep the same size, and the GUI looks the same
regardless of the size of the frame or form.

How do those developers do it?  How can I produce really professional
looking Swing UIs?  Suggestions are greatly appreciated.

Thanks!