Column<Product, String> imageColumn = new Column<Product, String>(new ClickableTextCell(){
			            public void render(Context context,
			                               SafeHtml value,
			                               SafeHtmlBuilder sb)
			            {
			                sb.appendHtmlConstant("<img width=\"100\" src="
			                                       + value.asString() + ">");
			            }
			        })
			        {
						@Override
						public String getValue(Product object) {
							return object.getImage();
						}
			        };