Works with normal = declaration but not with .add() function call? Why?

I still have some problems in relation to my earlier post:
http://forum.java.sun.com/thread.jspa?threadID=5164571&tstart=0
Help is still warmely appreciated! Thanks already to you Franzis.
So I try to add several JScrollPanes into on Container variable allComponents.
I don't understand why in my program
allComponents = jspane;works but
allComponents.add(jspane);does not.
Same is true for Jpanel objects. In my program
allComponents = panel;works but
allComponents.add(panel);does not. Why is this?
Still I necessarily need to work with a add() function.
So where is the problem?
The whole source code is at:
http://forum.java.sun.com/thread.jspa?threadID=5164571&tstart=0
Message was edited by:
wonderful123
null

I added a response in your original message:
http://forum.java.sun.com/thread.jspa?messageID=9629812
Let's keep to it since splitting things across two posts might be confusing.

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