diff --git a/src/controls/QskSpinBox.cpp b/src/controls/QskSpinBox.cpp
index 34fd4fbe..06857ca4 100644
--- a/src/controls/QskSpinBox.cpp
+++ b/src/controls/QskSpinBox.cpp
@@ -54,9 +54,7 @@ class QskSpinBox::PrivateData
 {
   public:
     PrivateData()
-        : tracking( true )
-        , wrapping( false )
-        , accelerating( false )
+        : wrapping( false )
     {
     }
 
@@ -128,9 +126,13 @@ class QskSpinBox::PrivateData
 
     int key = Qt::Key_unknown;
 
-    bool tracking     : 1;
     bool wrapping     : 1;
-    bool accelerating : 1; // not yet implemented: TODO ...
+
+#if 0
+    // not yet implemented: TODO ...
+    bool tracking     : 1;
+    bool accelerating : 1;
+#endif
 };
 
 QskSpinBox::QskSpinBox( qreal min, qreal max, qreal stepSize, QQuickItem* parent )
@@ -194,20 +196,6 @@ Qt::Alignment QskSpinBox::textAlignment() const
         aspectTextAlignment(), Qt::AlignLeft ) & Qt::AlignHorizontal_Mask;
 }
 
-void QskSpinBox::setTracking( bool on )
-{
-    if ( on != m_data->tracking )
-    {
-        m_data->tracking = on;
-        Q_EMIT trackingChanged( on );
-    }
-}
-
-bool QskSpinBox::isTracking() const
-{
-    return m_data->tracking;
-}
-
 void QskSpinBox::setWrapping( bool on )
 {
     if ( on != m_data->wrapping )
@@ -222,20 +210,6 @@ bool QskSpinBox::isWrapping() const
     return m_data->wrapping;
 }
 
-void QskSpinBox::setAccelerating( bool on )
-{
-    if ( on != m_data->accelerating )
-    {
-        m_data->accelerating = on;
-        Q_EMIT acceleratingChanged( on );
-    }
-}
-
-bool QskSpinBox::isAccelerating() const
-{
-    return m_data->accelerating;
-}
-
 void QskSpinBox::setDecimals( int decimals )
 {
     decimals = qBound( 0, decimals, DBL_MAX_10_EXP + DBL_DIG );
diff --git a/src/controls/QskSpinBox.h b/src/controls/QskSpinBox.h
index c6d54683..974a264d 100644
--- a/src/controls/QskSpinBox.h
+++ b/src/controls/QskSpinBox.h
@@ -16,12 +16,6 @@ class QSK_EXPORT QskSpinBox : public QskBoundedValueInput
     Q_PROPERTY( bool wrapping READ isWrapping
         WRITE setWrapping NOTIFY wrappingChanged )
 
-    Q_PROPERTY( bool tracking READ isTracking
-        WRITE setTracking NOTIFY trackingChanged )
-
-    Q_PROPERTY( bool accelerating READ isAccelerating
-        WRITE setAccelerating NOTIFY acceleratingChanged )
-
     Q_PROPERTY( Decoration decoration READ decoration
         WRITE setDecoration RESET resetDecoration NOTIFY decorationChanged )
 
@@ -66,12 +60,6 @@ class QSK_EXPORT QskSpinBox : public QskBoundedValueInput
     void setWrapping( bool );
     bool isWrapping() const;
 
-    void setTracking( bool );
-    bool isTracking() const;
-
-    void setAccelerating( bool );
-    bool isAccelerating() const;
-
     void setDecimals( int );
     int decimals() const;
 
@@ -84,9 +72,7 @@ class QSK_EXPORT QskSpinBox : public QskBoundedValueInput
     void decorationChanged( Decoration );
     void textAlignmentChanged( Qt::Alignment );
 
-    void trackingChanged( bool );
     void wrappingChanged( bool );
-    void acceleratingChanged( bool );
 
     void decimalsChanged( int );
     void textChanged();