Update Button to be made of Material

sky/framework/editing/editable_text.dart

Index: sky/framework/editing/editable_text.dart
diff --git a/sky/framework/editing/editable_text.dart b/sky/framework/editing/editable_text.dart
index 7ad78a93e8957bbdd46012d5c0e3738ca3f1d9ac..df73e46262334c72669827fe82d9bf4fdf3b6904 100644
--- a/sky/framework/editing/editable_text.dart
+++ b/sky/framework/editing/editable_text.dart
@@ -76,7 +76,7 @@ class EditableText extends Component {
       if (!composing.isEmpty) {
         children.add(new Container(
           key: 'composing', 
-          style: _composingStyle,
+          styles: [_composingStyle],
           children: [new Text(composing)]
         ));
       }
@@ -87,10 +87,10 @@ class EditableText extends Component {
     }
 
     if (_showCursor)
-      children.add(new Container(key: 'cursor', style: _cusorStyle));
+      children.add(new Container(key: 'cursor', styles: [_cusorStyle]));
 
     return new Container(
-      style: _style,
+      styles: [_style],
       children: children
     );
   }