Bug 145144 SVG Interactivity cannot highlight gradient colors
Create any SVG Chart with gradient colors on the series palette. Add interactivity on series to highlight them on mouseover for instance (or mouse click) The highlight doesn't work. It works for plain colors only.
chart/org.eclipse.birt.chart.device.svg/src/org/eclipse/birt/chart/device/svg/SVGGraphics2D.java
protected Element definitions;
	protected Element styles;
	protected Element codeScript;
	protected String styleClass;
	protected String id;
	protected StringBuffer scriptBuffer = new StringBuffer();
	protected StringBuffer styleBuffer = new StringBuffer();
	protected Element deferStrokColor = null;	
	protected String primitiveId = null;
	private RenderingHints renderingHints = new RenderingHints(null);
	protected static final String defaultStyles = "fill:none;stroke:none"; 
	private static ILogger logger = Logger.getLogger( "org.eclipse.birt.chart.device.svg/trace" ); 
	public SVGGraphics2D( Document dom )
	{
		this.dom = dom;
		fontRenderContext = new FontRenderContext( new AffineTransform( ),
				true,
				false );
		currentElement = dom.getDocumentElement( );
		parentStack.push( currentElement );
		currentParent = currentElement;
		
		currentElement = dom.createElement( "g" ); 
		definitions = dom.createElement( "defs" ); 
		
		currentElement.setAttribute("id", "outerG"); 
		currentElement.appendChild( definitions );
		currentElement.setAttribute( "style", defaultStyles ); 
		pushParent( currentElement );
		transforms = new AffineTransform( );