Bug 136256 Enhance the message builder
Please see the spec attached in 133995 for detail.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ImageBuilder.java
.getDisplay( )
				.getActiveShell( ),
				handle );
		
		
		
		if ( dialog.open( ) == Dialog.OK )
		{
			stack.commit( );
		}
		else
		{
			stack.rollback( );
		}
	}
	private java.util.List unionDataSets( )
	{
		dataSetList = new ArrayList(inputDataSetList);
		if ( inputImage == null || inputImage.getDataSet( ) == null )
		{
			return dataSetList;
		}
		int i = inputDataSetList.indexOf( inputImage.getDataSet( ) );
		if ( i == -1 )
		{
			dataSetList.add( inputImage.getDataSet( ) );
		}
		return dataSetList;
	}
}