I want to create a bean wich on a keystroke add a button to a JtextPane

Question

The bean have two JComponents : a JTextPane and a JButton.
Innitialy the bean must show just the JTextPane.
When I press key F1 I want that the JButton to be added on the right part of the JTextPane, and be painted inside JTextPane.
I've tried something like that :
jTextPaneInstance.add(jButtonInstance,0);
jTextPaneInstance.valdate;
jTextPaneInstance.repaint;
This seems to add the component on top of jTextPaneInstance but do not paint the button over a part of jTextPaneInstance.
Thank you!

Answer 1

PS: Also, why my method do not work ? :
JTextPaneInstance.add(JButtonInstance);
JTextPaneInstance.validate;
JTextPaneInstance.repaint;
I must say that a similar example works but only if I add a JComponent to a JButton:
JButtonInstance.add(JCheckBoxInstance);
JButtonInstance.validate(JCheckBoxInstance);
JButtonInstance.repaint(JCheckBoxInstance);
More interesting is the fact that in example in wich add a JCheckBoxInstance to a
JButtonInstance if afther that I add the JCheckBoxInstance to a JTextPaneInstance, it works(so , finally the other component, JCheckBoxInstance is painted in JTextPaneInstance) :
JButtonInstance.add(JCheckBoxInstance);
JButtonInstance.validate(JCheckBoxInstance);
JButtonInstance.repaint(JCheckBoxInstance);
//and after that, if I add the JCheckBoxInstance to a JTextPaneInstance, it works...
JTextPaneInstance.add(JCheckBoxInstance);
JTextPaneInstance.validate();
JTextPaneInstance.repaint();
)