AppCanvas don't set anymore position fixed on a child AppBar. Instea…

…d, AppBar should specify it's position (witch, by default is "fixed").

src/app-canvas.jsx

@@ -16,26 +16,9 @@ let AppCanvas = React.createClass({
       WebkitFontSmoothing: 'antialiased',
     };
 
-    let newChildren = React.Children.map(this.props.children, (currentChild) => {
-      if (!currentChild) { // If undefined, skip it
-        return null;
-      }
-
-      switch (currentChild.type.displayName) {
-        case 'AppBar' :
-          return React.cloneElement(currentChild, {
-            style: this.mergeStyles({
-              position: 'fixed',
-            }, currentChild.props.style),
-          });
-        default:
-          return currentChild;
-      }
-    }, this);
-
     return (
       <div style={styles}>
-        {newChildren}
+        {this.props.children}
       </div>
     );
   },