diff --git a/src/layouts/QskGridBox.cpp b/src/layouts/QskGridBox.cpp
index d180ea7c..dd327b23 100644
--- a/src/layouts/QskGridBox.cpp
+++ b/src/layouts/QskGridBox.cpp
@@ -425,39 +425,6 @@ bool QskGridBox::retainSizeWhenHidden( QQuickItem* item ) const
     return false;
 }
 
-QSizeF QskGridBox::contentsSizeHint() const
-{
-    if ( !isActive() )
-        return QSizeF( -1, -1 );
-
-    if ( itemCount() == 0 )
-        return QSizeF( 0, 0 );
-
-    return engine().sizeHint( Qt::PreferredSize );
-}
-
-qreal QskGridBox::heightForWidth( qreal width ) const
-{
-    const auto m = margins();
-    width -= m.left() + m.right();
-
-    qreal height = engine().heightForWidth( width );
-
-    height += m.top() + m.bottom();
-    return height;
-}
-
-qreal QskGridBox::widthForHeight( qreal height ) const
-{
-    const auto m = margins();
-    height -= m.top() + m.bottom();
-
-    qreal width = engine().widthForHeight( height );
-
-    width += m.left() + m.right();
-    return width;
-}
-
 void QskGridBox::setRowSizeHint(
     Qt::SizeHint which, int row, qreal size, Qt::Orientation orientation )
 {
diff --git a/src/layouts/QskGridBox.h b/src/layouts/QskGridBox.h
index 22e3ee41..d3b6c577 100644
--- a/src/layouts/QskGridBox.h
+++ b/src/layouts/QskGridBox.h
@@ -113,11 +113,6 @@ class QSK_EXPORT QskGridBox : public QskLayoutBox
     Q_INVOKABLE bool retainSizeWhenHidden( QQuickItem* ) const;
     Q_INVOKABLE void setRetainSizeWhenHidden( QQuickItem*, bool on );
 
-    qreal heightForWidth( qreal width ) const override;
-    qreal widthForHeight( qreal height ) const override;
-
-    QSizeF contentsSizeHint() const override;
-
   Q_SIGNALS:
     void verticalSpacingChanged();
     void horizontalSpacingChanged();
diff --git a/src/layouts/QskLayoutBox.cpp b/src/layouts/QskLayoutBox.cpp
index 7ca60599..447485bd 100644
--- a/src/layouts/QskLayoutBox.cpp
+++ b/src/layouts/QskLayoutBox.cpp
@@ -250,6 +250,44 @@ QRectF QskLayoutBox::alignedLayoutRect( const QRectF& rect ) const
     return rect;
 }
 
+QSizeF QskLayoutBox::contentsSizeHint() const
+{   
+   if ( !isActive() )
+        return QSizeF( -1, -1 );
+
+    if ( itemCount() == 0 )
+        return QSizeF( 0, 0 );
+
+    return layoutItemsSizeHint();
+}
+
+QSizeF QskLayoutBox::layoutItemsSizeHint() const
+{
+    return engine().sizeHint( Qt::PreferredSize );
+}
+
+qreal QskLayoutBox::heightForWidth( qreal width ) const
+{
+    const auto m = margins();
+    width -= m.left() + m.right();
+    
+    qreal height = engine().heightForWidth( width );
+    
+    height += m.top() + m.bottom();
+    return height;
+}   
+
+qreal QskLayoutBox::widthForHeight( qreal height ) const
+{
+    const auto m = margins();
+    height -= m.top() + m.bottom();
+    
+    qreal width = engine().widthForHeight( height );
+    
+    width += m.left() + m.right();
+    return width;
+}   
+
 void QskLayoutBox::geometryChangeEvent( QskGeometryChangeEvent* event )
 {
     Inherited::geometryChangeEvent( event );
diff --git a/src/layouts/QskLayoutBox.h b/src/layouts/QskLayoutBox.h
index 0bac68a7..e80cc894 100644
--- a/src/layouts/QskLayoutBox.h
+++ b/src/layouts/QskLayoutBox.h
@@ -39,6 +39,11 @@ class QSK_EXPORT QskLayoutBox : public QskControl
     void adjustItem( const QQuickItem* );
     void adjustItemAt( int index );
 
+    QSizeF contentsSizeHint() const override;
+
+    qreal heightForWidth( qreal width ) const override;
+    qreal widthForHeight( qreal height ) const override;
+
   public Q_SLOTS:
     void activate();
     void invalidate();
@@ -62,6 +67,7 @@ class QSK_EXPORT QskLayoutBox : public QskControl
     virtual void layoutItemRemoved( QskLayoutItem*, int index );
 
     virtual QRectF alignedLayoutRect( const QRectF& ) const;
+    virtual QSizeF layoutItemsSizeHint() const;
 
   private:
     class PrivateData;
diff --git a/src/layouts/QskLinearBox.cpp b/src/layouts/QskLinearBox.cpp
index 2648e4f9..84ab5841 100644
--- a/src/layouts/QskLinearBox.cpp
+++ b/src/layouts/QskLinearBox.cpp
@@ -320,39 +320,6 @@ int QskLinearBox::columnStretchFactor( int column ) const
     return engine().rowStretchFactor( column, Qt::Horizontal );
 }
 
-QSizeF QskLinearBox::contentsSizeHint() const
-{
-    if ( !isActive() )
-        return QSizeF( -1, -1 );
-
-    if ( itemCount() == 0 )
-        return QSizeF( 0, 0 );
-
-    return engine().sizeHint( Qt::PreferredSize );
-}
-
-qreal QskLinearBox::heightForWidth( qreal width ) const
-{
-    const auto m = margins();
-    width -= m.left() + m.right();
-
-    qreal height = engine().heightForWidth( width );
-
-    height += m.top() + m.bottom();
-    return height;
-}
-
-qreal QskLinearBox::widthForHeight( qreal height ) const
-{
-    const auto m = margins();
-    height -= m.top() + m.bottom();
-
-    qreal width = engine().widthForHeight( height );
-
-    width += m.left() + m.right();
-    return width;
-}
-
 void QskLinearBox::setupLayoutItem( QskLayoutItem* layoutItem, int index )
 {
     int col = index % m_data->dimension;
diff --git a/src/layouts/QskLinearBox.h b/src/layouts/QskLinearBox.h
index be16d7ad..67181591 100644
--- a/src/layouts/QskLinearBox.h
+++ b/src/layouts/QskLinearBox.h
@@ -72,11 +72,6 @@ class QSK_EXPORT QskLinearBox : public QskIndexedLayoutBox
     Q_INVOKABLE bool retainSizeWhenHidden( QQuickItem* ) const;
     Q_INVOKABLE void setRetainSizeWhenHidden( QQuickItem*, bool on );
 
-    QSizeF contentsSizeHint() const override;
-
-    qreal heightForWidth( qreal width ) const override;
-    qreal widthForHeight( qreal height ) const override;
-
 #if 1
     Q_INVOKABLE void setRowSpacing( int row, qreal spacing );
     Q_INVOKABLE qreal rowSpacing( int row ) const;
diff --git a/src/layouts/QskStackBox.cpp b/src/layouts/QskStackBox.cpp
index c7529035..20ea3c1d 100644
--- a/src/layouts/QskStackBox.cpp
+++ b/src/layouts/QskStackBox.cpp
@@ -139,7 +139,7 @@ void QskStackBox::setCurrentIndex( int index )
         return;
 
     // stop and complete the running transition
-    QskStackBoxAnimator* animator = effectiveAnimator();
+    auto animator = effectiveAnimator();
     if ( animator )
         animator->stop();
 
@@ -158,8 +158,8 @@ void QskStackBox::setCurrentIndex( int index )
     }
     else
     {
-        QQuickItem* item1 = itemAtIndex( m_data->currentIndex );
-        QQuickItem* item2 = itemAtIndex( index );
+        auto item1 = itemAtIndex( m_data->currentIndex );
+        auto item2 = itemAtIndex( index );
 
         if ( item1 )
             item1->setVisible( false );
@@ -177,24 +177,18 @@ void QskStackBox::setCurrentItem( const QQuickItem* item )
     setCurrentIndex( indexOf( item ) );
 }
 
-QSizeF QskStackBox::contentsSizeHint() const
+QSizeF QskStackBox::layoutItemsSizeHint() const
 {
-    if ( !isActive() )
-        return QSizeF( -1, -1 );
-
-    if ( itemCount() == 0 )
-        return QSizeF( 0, 0 );
-
     qreal width = -1;
     qreal height = -1;
 
     QSizeF constraint( -1, -1 );
     Qt::Orientations constraintOrientation = 0;
 
-    const QskLayoutEngine& engine = this->engine();
+    const auto& engine = this->engine();
     for ( int i = 0; i < engine.itemCount(); i++ )
     {
-        const QskLayoutItem* layoutItem = engine.layoutItemAt( i );
+        const auto layoutItem = engine.layoutItemAt( i );
 
         if ( layoutItem->hasDynamicConstraint() )
         {
@@ -221,7 +215,7 @@ QSizeF QskStackBox::contentsSizeHint() const
 
         for ( int i = 0; i < engine.itemCount(); i++ )
         {
-            const QskLayoutItem* layoutItem = engine.layoutItemAt( i );
+            const auto layoutItem = engine.layoutItemAt( i );
 
             if ( layoutItem->hasDynamicConstraint() &&
                 layoutItem->dynamicConstraintOrientation() == Qt::Horizontal )
@@ -240,7 +234,7 @@ QSizeF QskStackBox::contentsSizeHint() const
 
         for ( int i = 0; i < engine.itemCount(); i++ )
         {
-            const QskLayoutItem* layoutItem = engine.layoutItemAt( i );
+            const auto layoutItem = engine.layoutItemAt( i );
 
             if ( layoutItem->hasDynamicConstraint() &&
                 layoutItem->dynamicConstraintOrientation() == Qt::Vertical )
diff --git a/src/layouts/QskStackBox.h b/src/layouts/QskStackBox.h
index e138d2f5..fd7d2d25 100644
--- a/src/layouts/QskStackBox.h
+++ b/src/layouts/QskStackBox.h
@@ -31,8 +31,6 @@ class QSK_EXPORT QskStackBox : public QskIndexedLayoutBox
     QQuickItem* currentItem() const;
     int currentIndex() const;
 
-    QSizeF contentsSizeHint() const override;
-
     qreal heightForWidth( qreal width ) const override;
     qreal widthForHeight( qreal height ) const override;
 
@@ -50,6 +48,7 @@ class QSK_EXPORT QskStackBox : public QskIndexedLayoutBox
 
   protected:
     QskStackBoxAnimator* effectiveAnimator();
+    QSizeF layoutItemsSizeHint() const override;
 
   private:
     friend class QskStackBoxAnimator;