Bug 417317 Error when running chart example SwingInteractivityViewer.java.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/InteractiveRenderer.java
for ( Iterator<LineAttributes> iter = savedLines.keySet( ).iterator( ); iter.hasNext( ); )
		{
			LineAttributes original = iter.next( );
			LineAttributes copy = savedLines.get( original );
			original.setVisible( copy.isVisible( ) );
		}
		savedLines.clear( );
		for ( Iterator<Label> iter = savedLabels.keySet( ).iterator( ); iter.hasNext( ); )
		{
			Label original = iter.next( );
			Label copy = savedLabels.get( original );
			original.setVisible( copy.isVisible( ) );
			original.getCaption( ).setFont( copy.getCaption( ).getFont( ) );
		}
		savedLabels.clear( );
	}
	public void setUpdateNotifier( IUpdateNotifier _iun )
	{
		this.iun = _iun;
	}
	public void reset( )
	{
		iun = null;
		savedColors.clear( );
		savedLabels.clear( );
		savedLines.clear( );
		targets.clear( );
	}
}