Bug 144556 [Dialogs] TitleAreaDialog fails to properly recreate when an instance is reopened
When a TitleAreaDialog is created, opened, closed and opened again on the same instance the messageArea is not properly checked against disposal when it is accessed in setWarningMessage throwing an SWTException for disposed when the message area is updated the second time the dialog is opened.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/TitleAreaDialog.java
messageImageLabel.setImage(messageImage);
            setImageLabelVisible(messageImage != null);
            layoutForNewMessage();
        }
    }
    /**
     * Update the contents of the messageLabel.
     * 
     * @param newMessage
     *            the message to use
     */
    private void updateMessage(String newMessage) {
        messageLabel.setText(newMessage);
    }
    /**
     * Sets the title to be shown in the title area of this dialog.
     * 
     * @param newTitle
     *            the title show
     */
    public void setTitle(String newTitle) {
        if (titleLabel == null) {
			return;
		}
        String title = newTitle;
        if (title == null) {
			title = "";
		}
        titleLabel.setText(title);
    }