Fix problems with core plugin virtually

src/api/QGCCorePlugin.h

@@ -37,8 +37,8 @@ public:
     Q_PROPERTY(int          defaultSettings     READ defaultSettings    CONSTANT)
     Q_PROPERTY(QGCOptions*  options             READ options            CONSTANT)
 
-    Q_PROPERTY(bool         showTouchAreas      MEMBER _showTouchAreas  NOTIFY showTouchAreasChanged)
-    Q_PROPERTY(bool         showAdvancedUI      MEMBER _showAdvancedUI  NOTIFY showAdvancedUIChanged)
+    Q_PROPERTY(bool         showTouchAreas      READ showTouchAreas     NOTIFY showTouchAreasChanged)
+    Q_PROPERTY(bool         showAdvancedUI      READ showAdvancedUI     NOTIFY showAdvancedUIChanged)
 
     Q_PROPERTY(QString      brandImageIndoor    READ brandImageIndoor   CONSTANT)
     Q_PROPERTY(QString      brandImageOutdoor   READ brandImageIndoor   CONSTANT)
@@ -71,6 +71,9 @@ public:
     /// Return the resource file which contains the brand image for for Outdoor theme.
     virtual QString brandImageOutdoor(void) const { return QString(); }
 
+    bool showTouchAreas(void) { return _showTouchAreas; }
+    bool showAdvancedUI(void) { return _showAdvancedUI; }
+
     // Override from QGCTool
     void                            setToolbox          (QGCToolbox *toolbox);
 

src/api/QGCOptions.h

@@ -52,12 +52,12 @@ public:
     virtual CustomInstrumentWidget* instrumentWidget();
 
     /// By returning false you can hide the following sensor calibration pages
-    bool showSensorCalibrationCompass   () const { return true; }
-    bool showSensorCalibrationGyro      () const { return true; }
-    bool showSensorCalibrationAccel     () const { return true; }
-    bool showSensorCalibrationLevel     () const { return true; }
-    bool showSensorCalibrationAirspeed  () const { return true; }
-    bool showSensorCalibrationOrient    () const { return true; }
+    virtual bool showSensorCalibrationCompass   () const { return true; }
+    virtual bool showSensorCalibrationGyro      () const { return true; }
+    virtual bool showSensorCalibrationAccel     () const { return true; }
+    virtual bool showSensorCalibrationLevel     () const { return true; }
+    virtual bool showSensorCalibrationAirspeed  () const { return true; }
+    virtual bool showSensorCalibrationOrient    () const { return true; }
 
 signals:
     void showSensorCalibrationCompassChanged    (bool show);