[react-native] In TouchableOpacity, access .props on element, not component

Libraries/Components/Touchable/TouchableOpacity.js

@@ -106,10 +106,8 @@ var TouchableOpacity = React.createClass({
   },
 
   touchableHandleActivePressOut: function() {
-    var childStyle = (
-      this.refs[CHILD_REF].props &&
-      flattenStyle(this.refs[CHILD_REF].props.style)
-    ) || {};
+    var child = onlyChild(this.props.children);
+    var childStyle = flattenStyle(child.props.style) || {};
     this.setOpacityTo(childStyle.opacity === undefined ? 1 : childStyle.opacity);
     this.props.onPressOut && this.props.onPressOut();
   },