Bug 243758 [Contributions] Accelerators in menus are not installed until menu shown
bundles/org.eclipse.jface/src/org/eclipse/jface/window/ApplicationWindow.java
* 
     * @param shell the shell
     * @since 3.0
     */
    protected void createTrimWidgets(Shell shell) {
        if (menuBarManager != null) {
            menuBarManager.updateAll(true);
            shell.setMenuBar(menuBarManager.createMenuBar((Decorations) shell));
        }
        if (showTopSeperator()) {
			seperator1 = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
		}
        
        createToolBarControl(shell);
        createCoolBarControl(shell);
        createStatusLine(shell);
    }
    /* (non-Javadoc)
     * @see org.eclipse.jface.window.Window#getLayout()
     */
    protected Layout getLayout() {
        return new ApplicationWindowLayout();
    }
    /**
     * Returns whether to show a top separator line between the menu bar
     * and the rest of the window contents.  On some platforms such as the Mac,
     * the menu is separated from the main window already, so a separator line
     * is not desired. 
     * 
     * @return <code>true</code> to show the top separator, <code>false</code>