Bug 132645 Mouse Double Click/URL Redirect on Y series of Line Chart does not work
Decription: Add a interactivity on line chart, mouse double click/URL Redirect on Y Series, does not work. Steps to reproduce: 1.Add a line chart, bind with valid dataset. 2.In the "Format Chart" tab, add a interactivity on "Value(Y) Series", the type is "Mouse Double Click", and the action is set "URL Redirect". 3.Preview in layout, click on the Y Series, interactivity does not work.
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/image/JavaxImageIOWriter.java
_g2d.setPaint( Color.WHITE );
			_g2d.fillRect( 0, 0, _img.getWidth( null ), _img.getHeight( null ) );
		}
		
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.device.IDeviceRenderer#after()
	 */
	public void after( ) throws ChartException
	{
		super.after( );
		if ( _oOutputIdentifier != null )
		{
			
			Iterator it = null;
			String s = getFormat( );
			if ( s != null )
			{
				it = ImageIO.getImageWritersByFormatName( s );
				if ( !it.hasNext( ) )
				{
					it = null; 
				}
			}
			
			if ( it == null )
			{