Bug 56637 [Preferences] DialogMessageArea image is too large
Is the background color of the error shown by DialogMessageArea to be changed? Or do you intend to leave it as it is right now? The error message looks a little out of place in the current implementation (being surrounded by white space).
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
*/
	protected void setSelectedNodePreference(String pageId) {
		lastPreferenceId = pageId;
	}
	/**
	 * Changes the shell size to the given size, ensuring that
	 * it is no larger than the display bounds.
	 * 
	 * @param width the shell width
	 * @param height the shell height
	 */
	private void setShellSize(int width, int height) {
		
		Rectangle preferred = getShell().getBounds();
		preferred.width = width;
		preferred.height = height;
		
		getShell().setBounds(getConstrainedShellBounds(preferred));
	}
	
	/**
	 * Shows the preference page corresponding to the given preference node.
	 * Does nothing if that page is already current.
	 *
	 * @param node the preference node, or <code>null</code> if none
	 * @return <code>true</code> if the page flip was successful, and
	 * <code>false</code> is unsuccessful
	 */
	protected boolean showPage(IPreferenceNode node) {
		if (node == null)