JFrame doesn't really redraw...

I made a Projekt for Seek and Exchange, using a JFrame as MainFrame.
If a User klicks on 'Do it' the Program seeks in files, and shows the results in a Panel, I init. in another Panel of the MainFrame (BorderLayout:South), and... nothing, theres no error, but theres also no Panel, untill the User resizes the Frame with the Mouse, I tried to fix it, by resizing the MainFrame by Code, but still theres nothing, untill te User resizes.
I know this is a well known Problem, but I hope someone got sth. for me.

I got another Prob with this...
I tell my JTextPane to select the word founded with seek, by this:
void showtext(int index){
jtext.setText(littlehelper.ShowFile(found[index].infile));
//littlehelper.showfile opens a given file to a String
jtext.select(found[index].atindex,found[index].atindex+found[index].found.length());
//found[index].atindex is the startindex of the founded String
//stored in found[index].found.
}but nothing, no error, no selecting, even if the user resises the Frame, nothing...
who can help me with this??

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