Bug 172655 [ErrorHandling] [StatusHandling] Hooking into JFace dialogs
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/MessageDialog.java
* @param parent
     *            parent composite to contain the custom area
     * @return the custom area control, or <code>null</code>
     */
    protected Control createCustomArea(Composite parent) {
        return null;
    }
    /**
     * This implementation of the <code>Dialog</code> framework method creates
     * and lays out a composite and calls <code>createMessageArea</code> and
     * <code>createCustomArea</code> to populate it. Subclasses should
     * override <code>createCustomArea</code> to add contents below the
     * message.
     */
    protected Control createDialogArea(Composite parent) {
        
        createMessageArea(parent);
        
        Composite composite = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.marginHeight = 0;
        layout.marginWidth = 0;
        composite.setLayout(layout);
        GridData data = new GridData(GridData.FILL_BOTH);
        data.horizontalSpan = 2;
        composite.setLayoutData(data);
        
        customArea = createCustomArea(composite);
        
        if (customArea == null) {