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
* <p>
	 * Subclasses may override.
	 * </p>
	 */
	protected void handleSave() {
		Iterator nodes = preferenceManager.getElements(PreferenceManager.PRE_ORDER).iterator();
		while (nodes.hasNext()) {
			IPreferenceNode node = (IPreferenceNode) nodes.next();
			IPreferencePage page = node.getPage();
			if (page instanceof PreferencePage) {
				
				IPreferenceStore store = ((PreferencePage) page).getPreferenceStore();
				if (store != null
					&& store.needsSaving()
					&& store instanceof IPersistentPreferenceStore) {
					try {
						((IPersistentPreferenceStore) store).save();
					} catch (IOException e) {
						MessageDialog.openError(getShell(), JFaceResources.getString("PreferenceDialog.saveErrorTitle"), 
						JFaceResources.format("PreferenceDialog.saveErrorMessage", new Object[] { page.getTitle(), e.getMessage()})); 
					}
				}
			}
		}
	}
	/**
	 * Notifies that the window's close button was pressed, 
	 * the close menu was selected, or the ESCAPE key pressed.
	 * <p>
	 * The default implementation of this framework method