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
}
		
		if ( !supported )
		{
			s = getMimeType( );
			if ( s != null )
			{
				Iterator it = ImageIO.getImageWritersByMIMEType( s );
				if ( it.hasNext( ) )
				{
					supported = true;
				}
			}
		}
		return supported;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.device.IDeviceRenderer#before()
	 */
	public void before( ) throws ChartException
	{
		super.before( );
		_bImageExternallySpecified = ( _img != null );
		
		
		if ( !_bImageExternallySpecified )
		{
			if ( _bo == null )