/**
* Creates the menu at the top of the shell where most of the programs functionality is accessed.
*
* @return The <code>Menu</code> widget that was created
*/
private Menu createMenuBar() {
Menu menuBar = new Menu(shell, SWT.BAR);
shell.setMenuBar(menuBar);
// create each header and subMenu for the menuBar
createFileMenu(menuBar);
createEditMenu(menuBar);
createSearchMenu(menuBar);
createHelpMenu(menuBar);
return menuBar;
}