Update Button to be made of Material

sky/examples/stocks-fn/stockrow.dart

Index: sky/examples/stocks-fn/stockrow.dart
diff --git a/sky/examples/stocks-fn/stockrow.dart b/sky/examples/stocks-fn/stockrow.dart
index 6eb9df648039df1e2b1914a16fdf5e35798ebe74..cacb3c0d891661e9029333df4f9d7fd2dcdadd7a 100644
--- a/sky/examples/stocks-fn/stockrow.dart
+++ b/sky/examples/stocks-fn/stockrow.dart
@@ -47,23 +47,23 @@ class StockRow extends Component {
       ),
       new Container(
         key: 'Ticker',
-        style: _tickerStyle,
+        styles: [_tickerStyle],
         children: [new Text(stock.symbol)]
       ),
       new Container(
         key: 'LastSale',
-        style: _lastSaleStyle,
+        styles: [_lastSaleStyle],
         children: [new Text(lastSale)]
       ),
       new Container(
         key: 'Change',
-        style: _changeStyle,
+        styles: [_changeStyle],
         children: [new Text(changeInPrice)]
       )
     ];
 
     return new Material(
-      style: _style,
+      styles: [_style],
       children: children
     );
   }