private void initializeDescription(CodeUnit codeUnit) {
		String defaultComment = getEolComment(codeUnit);

		BookmarkManager bmMgr = program.getBookmarkManager();
		Bookmark[] bookmarks = bmMgr.getBookmarks(address, BookmarkType.NOTE);
		if (bookmarks.length != 0) {
			categoryComboBox.setSelectedItem(bookmarks[0].getCategory());
			descriptionTextField.setText(bookmarks[0].getComment());
		}
		else {
			descriptionTextField.setText(defaultComment);
		}
		descriptionTextField.setCaretPosition(0);
		descriptionTextField.selectAll();
	}
Returns a ComboBoxModel populated with a sorted unique list
of all currently defined Bookmark categories.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/bookmark/CreateBookmarkDialog.java