Fix issue #309

declare $define as protected in Form.java because it needs to be
overridden by Screen1 which is always in a different package.

Change-Id: I318d453fa435700c72dfde310afac11a197ff456

appinventor/components/src/com/google/appinventor/components/runtime/Form.java

@@ -441,7 +441,8 @@ public class Form extends Activity
    * {@link com.google.appinventor.components.scripts.LangDefXmlGenerator},
    * respectively.  The actual implementation appears in {@code runtime.scm}.
    */
-  void $define() {
+  protected void $define() {    // This must be declared protected because we are called from Screen1 which subclasses
+                                // us and isn't in our package.
     throw new UnsupportedOperationException();
   }