public void addButton(Clickable button) {
	button.setPreferredSize(BUTTON_SIZE, BUTTON_SIZE);
	add(button);
}
 

/**
 * @return The Clickable that is used to expand/collapse the drawer.
 */
public Clickable getCollapseToggle() {
	return collapseToggle;
}
 

/**
 * Add a button to the tool bar. New button will be added to the 'end' of
 * the tool bar.
 * 
 * @param button
 *            New button
 */
public void addToolbarButton(final Clickable button) {
	toolbar.addButton(button);
}