Bug 156456 [Forms] widgets accept focus even though they can't do anything with it
Many of the widgets in the Forms library (Section, BusyIndicator, FormHeading) will accept keyboard focus even though they can't do anything with it. The impact is that when someone calls setFocus on a Form that contains a FormHeading at its top (which is quite common), keyboard focus ends up nowhere. Looking at the patterns in SWT, it appears that the correct protocol is for controls to return false from setFocus if they can't do anything with the focus so that the caller can try assigning focus somewhere else.
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/ExpandableComposite.java
* Tests if this expandable composite renders a title bar around the text.
	 * 
	 * @return <code>true</code> for <code>TITLE_BAR</code> or
	 *         <code>SHORT_TITLE_BAR</code> styles, <code>false</code>
	 *         otherwise.
	 */
	protected boolean hasTitleBar() {
		return (getExpansionStyle() & TITLE_BAR) != 0
				|| (getExpansionStyle() & SHORT_TITLE_BAR) != 0;
	}
	/**
	 * Sets the color of the title bar foreground when TITLE_BAR style is used.
	 * 
	 * @param color
	 *            the title bar foreground
	 */
	public void setTitleBarForeground(Color color) {
		titleBarForeground = color;
		textLabel.setForeground(color);
	}
	/**
	 * Returns the title bar foreground when TITLE_BAR style is used.
	 * 
	 * @return the title bar foreground
	 */
	public Color getTitleBarForeground() {
		return titleBarForeground;
	}
	
	private void toggleState() {