Bug 246105 [Dialogs] Title and description not layed out properly when title image is null
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/TitleAreaDialog.java
verticalSpacing);
			messageLabelData.right = new FormAttachment(titleImageLabel);
			messageLabelData.left = new FormAttachment(messageImageLabel, 0);
			messageLabelData.height = messageLabelHeight;
			if (titleImageLargest)
				messageLabelData.bottom = new FormAttachment(titleImageLabel,
						0, SWT.BOTTOM);
			messageLabel.setLayoutData(messageLabelData);
		}
		
		
		if (dialogArea != null)
			workArea.getParent().layout(true);
	}
	/**
	 * Set the message text. If the message line currently displays an error,
	 * the message is saved and will be redisplayed when the error message is
	 * set to <code>null</code>.
	 * <p>
	 * Shortcut for <code>setMessage(newMessage, IMessageProvider.NONE)</code>
	 * </p>
	 * This method should be called after the dialog has been opened as it
	 * updates the message label immediately.
	 * 
	 * @param newMessage
	 *            the message, or <code>null</code> to clear the message
	 */
	public void setMessage(String newMessage) {
		setMessage(newMessage, IMessageProvider.NONE);
	}