Repaint J Pane problem ?

[dagz]

I am trying to remove objects from a jpane and then add new ones, basicly redrawing the screen. however i can not get the screen to refresh correctly.
if i use the code

this.getContentPane().removeAll();
jTextPane2.setText("A new pane was added!!");
contentPane.add(jTextPane2, new XYConstraints(122, 102, 123, 87));

it removes everythign but notthing new is added even if i use the repaint command.

if i use the code
this.getContentPane().remove(jTextPane1);
jTextPane2.setText("A new pane was added!!");
contentPane.add(jTextPane2, new XYConstraints(122, 102, 123, 87));

and call it twice then the first time the old text pane is removed the secodn time the newone is added.

i also tried using differnt jpane but i get a run time error that says pane can not be added to a parent.

can any tell me what i doing worng or how to do what i want to