haven't clicked the link, but these steps should work (depending on structure)
add a ChangeListener, which gets the 'selected tab', then textArea['selected tab'].setText(textField.getText()); or panel['selected tab'].textArea.setText(textField.getText());
Uhm, my problem is actually this.. Everytime you join a channel, it creates a new tab on the JTabbedPane.. The created new tab has a JPanel with a JTextArea inside it.. I'm having trouble on displaying the text messages on the the correct JTextArea of the correct tab.. So, any solution?