Bug 134988 [regression]Available items in Query didn't change when change data source in Edit Data Set Dialog.
Description: Available items in Query didn't change when change data source in Edit Data Set Dialog. Steps to reproduce: 1. New two different data sources. 2. New a dataset, change data source, view Available Items in Query pane. Expected result: Available Items in Query pane changed according to new Data source. Actual result: Available Items in Query pane kept unchanged.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/property/AbstractPropertyDialog.java
* default implementation of this method returns true. Sub classes may
	 * override this method to return false if they do not wish to show the
	 * title are.
	 * 
	 * @return boolean indicating whether the title should be displayed or not.
	 */
	protected boolean isTitleVisible( )
	{
		return true;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.ui.dialogs.properties.IPropertyPageContainer#setMessage(java.lang.String,
	 *      int)
	 */
	public final void setMessage( String message, int messageType )
	{
		if ( messageArea != null )
		{
			if ( messageType != IMessageProvider.NONE )
			{
				titleImage.setVisible( false );
			}
			else
			{
				titleImage.setVisible( true );
			}
			messageArea.updateText( message, messageType );
		}