private void create() {
		textPane = new JTextPane();
		textPane.setEditable(false);
		// Note that this panel in not focusable which means keyboard users can't navigate to
		// this text pane and therefore screen readers won't read it. To compensate for this
		// the history has been added as a tooltip on each tab.
		textPane.setFocusable(false);
		add(textPane, BorderLayout.CENTER);
		doc = textPane.getStyledDocument();
	}
Show the comment history
@param program program
@param addr address of comment history
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/comments/CommentHistoryPanel.java