canvas.setBackgroundColor

[sachage]

SC_SNAPSHOT-2012-03-09_v8.2p/Pro Deployment 2012-03-09
Chrome Version 27.0.1453.110 m
Hi

	private void setlistGridNews() {
		
		
		lgNews = new ListGrid() {
			public Canvas getExpansionComponent(ListGridRecord record) {  
				Canvas canvas = super.getExpansionComponent(record);  
				canvas.setMargin(25); 
				canvas.setBackgroundColor("#FF00FF");
            return canvas;  
			}  
		};  
		
		lgNews.setDataSource(frontendDs.getDsNews());
		lgNews.setShowHeader(true);
		lgNews.setCanSort(false);
		lgNews.setCellHeight(zeilenhoehe);
		lgNews.setWidth(611);
		lgNews.setHeight(100);
		lgNews.setTop(listGridTop + listGridHoehe + 20);
		lgNews.setLeft(listGridLeft);
		lgNews.setAutoFetchData(true);
		lgNews.setAlternateRecordStyles(false);
		lgNews.setSelectionType(SelectionStyle.SINGLE);
		lgNews.setDetailField("TEXT");
//		lgNews.setSortField("ID");
		lgNews.setSortDirection(SortDirection.DESCENDING);
		
		ListGridField lgfNewsDate = new ListGridField("DATUM","Datum");
		lgfNewsDate.setType(ListGridFieldType.DATE);
		lgfNewsDate.setAlign(Alignment.LEFT);
		lgfNewsDate.setWidth(75);
		ListGridField lgfNewsTitel = new ListGridField("TITEL","News");
		lgfNewsTitel.setWidth(520);


		//Hover
		
		lgNews.setCanHover(true);
		lgNews.setShowHover(true);
		lgNews.setHoverMode(HoverMode.DETAIL_FIELD);
		lgNews.setShowHoverComponents(true);
		lgNews.setHoverOpacity(0);
//		lgNews.setDetailDS(frontendDs.getDsNews());
		lgNews.setDetailField("TEXT");
//		lgNews.setExpan
	
		
		//Hover
		
		
		
		lgNews.addClickHandler(new ClickHandler() {
			
			@Override
			public void onClick(ClickEvent event) {
			
				Record rec = lgNews.getSelectedRecord();
				SC.say("ID: " + rec.getAttribute("ID"));
				
				
			}
		});
		lgNews.setFields(lgfNewsDate,lgfNewsTitel);
	}

setting backgroundcolor of canvas does not work.

How can i do this?

Thanks

Sacha