[Effen] Remove 'display' from drawer_header.dart.

sky/framework/components/drawer_header.dart

Index: sky/framework/components/drawer_header.dart
diff --git a/sky/framework/components/drawer_header.dart b/sky/framework/components/drawer_header.dart
index c1c1d528372423d38ca750fc6e2cc09ae5bf7c3d..ba3aae6d95eea5fde1801d15591aa031bee97acd 100644
--- a/sky/framework/components/drawer_header.dart
+++ b/sky/framework/components/drawer_header.dart
@@ -3,24 +3,20 @@
 // found in the LICENSE file.
 
 import '../fn.dart';
+import '../layout.dart';
 import '../theme/colors.dart';
 import '../theme/view_configuration.dart';
 
 class DrawerHeader extends Component {
   static final Style _style = new Style('''
-    display: flex;
-    flex-direction: column;
     height: ${140 + kStatusBarHeight}px;
-    -webkit-user-select: none;
     background-color: ${BlueGrey[50]};
     border-bottom: 1px solid #D1D9E1;
     padding-bottom: 7px;
     margin-bottom: 8px;'''
   );
 
-  static final Style _spacerStyle = new Style('''
-    flex: 1'''
-  );
+  static final FlexBoxParentData _spacerParentData = new FlexBoxParentData()..flex = 1;
 
   static final Style _labelStyle = new Style('''
     padding: 0 16px;'''
@@ -31,12 +27,13 @@ class DrawerHeader extends Component {
   DrawerHeader({ Object key, this.children }) : super(key: key);
 
   UINode build() {
-    return new Container(
+    return new FlexContainer(
+      direction: FlexDirection.Column,
       style: _style,
       children: [
-        new Container(
-          key: 'Spacer',
-          style: _spacerStyle
+        new ParentDataNode(
+          new Container(key: 'Spacer'),
+          _spacerParentData
         ),
         new Container(
           key: 'Label',