Achieving Windows XP "look"

http://www.nabble.com/file/p13335955/compare.png 

The above image shows my problem. When I create a GUI in netbeans, the
preview of the GUI does not match the actual GUI shown when running in two
ways. One (in a minor sense) is that it does not have the windows xp look
for its buttons, borders and such. Two, (more importantly) is that it does
not maintain the dimensions I give it. Notice how the bottom jpanel "grows"
horizontally when I run the program? 

Is this fixable/preventable?
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