Custom JPanel won't display

I am building a GUI in NetBeans and am running into some trouble. I have created a class that extends JPanel that I wish to display in a tabbed pane. When I add it to the tabbed pane in the GUI Builder, it adds, although it doesn't display its elements. When I run it, it doesn't display at all. I have stepped through it in the debugger, and the constructor is executed just fine. I don't want to post a bunch of code just yet, because I imagine my problem is something simple. What is the best way to create a custom JPanel like this and add it to another JPanel?

JPanel jp = new JPanel();
myJPanel mp = new myJPanel();
mp.add(mp);The first thing I'll tell you is to check your code for empty catch's.

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public spaceMediaDisplayObject(mediaObject mo){
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If it's null then you need to set the size of each component explicitly:
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I don't see this a reference to this problem alot on the web so I figure I must be missing something obvious but I just don't know what.
Does anyone have any ideas?
Thanks.
C

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http://frank.zinepal.com/unsign-a-jar-with-ant
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To get best help with any problem, I recommend posting an SSCCE rather than 'part of the code'.
<http://www.physci.org/codes/sscce.html>
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Custom JPanel won't display

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