diff --git a/src/application/xqchildmodel.cpp b/src/application/xqchildmodel.cpp
index 61198b2..1fe71fb 100644
--- a/src/application/xqchildmodel.cpp
+++ b/src/application/xqchildmodel.cpp
@@ -57,8 +57,7 @@ void XQChildModel::addModelData( const XQNodePtr& contentRoot )
 
     const XQModelSection& section = _sections.sectionByKey( key );
     section.setContentRootNode( contentEntry->parent() );
-    // FaRZ!
-    //int newRow = _sections.lastRow(section);
+    int newRow = _sections.lastRow(section);
 
     XQNodePtr sheetNode = section.sheetRootNode();
     XQItemList list = _itemFactory.makeRow( sheetNode, contentEntry );
@@ -80,8 +79,7 @@ void XQChildModel::addSectionEntry( const QString& key, const XQNodePtr& content
   if(section.isValid() )
   {
     section.setContentRootNode( contentEntry->parent() );
-    // FARZ!
-    int newRow = 1;//_sections.lastRow(section);
+    int newRow =_sections.lastRow(section);
     XQNodePtr sheetNode = section.sheetRootNode();
     XQItemList list = _itemFactory.makeRow( sheetNode, nullptr );
     insertRow( newRow, list);
diff --git a/src/model/xqcommand.h b/src/model/xqcommand.h
index 3317403..607f186 100644
--- a/src/model/xqcommand.h
+++ b/src/model/xqcommand.h
@@ -61,6 +61,8 @@ public:
     cmdNew,
     cmdDelete,
 
+    cmdToggleSection,
+
     cmdExtern //??
   };
 
diff --git a/src/model/xqsectionmanager.cpp b/src/model/xqsectionmanager.cpp
index 4f09f01..b546a87 100644
--- a/src/model/xqsectionmanager.cpp
+++ b/src/model/xqsectionmanager.cpp
@@ -40,7 +40,7 @@ bool XQModelSection::isValid() const
   return _modelIndex.isValid() && _sectionRootNode;
 }
 
-QModelIndex XQModelSection::persistentModelIndex() const
+QModelIndex XQModelSection::startIndex() const
 {
   return _modelIndex.operator QModelIndex();
 }
@@ -80,7 +80,7 @@ void XQModelSection::setContentRootNode( const XQNodePtr contentRootNode ) const
 
 //! gibt die zeile des start-index zurück.
 
-int XQModelSection::XQModelSection::row() const
+int XQModelSection::XQModelSection::firstRow() const
 {
   return _modelIndex.row();
 }
@@ -111,7 +111,7 @@ bool XQSectionManager::hasValidSection(const QString& sectionKey) const
   return _sections.at(sectionKey).isValid();
 }
 
-const XQModelSection& XQSectionManager::sectionByKey( const QString& sectionKey )
+const XQModelSection& XQSectionManager::sectionByKey( const QString& sectionKey ) const
 {
   if( hasValidSection( sectionKey ) )
     return _sections.at(sectionKey);
@@ -121,29 +121,20 @@ const XQModelSection& XQSectionManager::sectionByKey( const QString& sectionKey
 
 }
 
-//! gibt für einen model index die 'zuständige' section zurück.
-
-const XQModelSection& XQSectionManager::sectionByIndex( const QModelIndex& index ) const
-{
-  return sectionByRow( index.row() );
-}
-
 
 //! gibt für eine zeile die 'zuständige' section zurück: der bestand an section wird
 //! nach der passenden section durchsucht.
 
 const XQModelSection& XQSectionManager::sectionByRow(int itemRow ) const
 {
-
   int i = _sections.size() - 1;
   for (; i >= 0; --i)
   {
-    if ( _sections.at(i).persistentModelIndex().row() < itemRow )
+    if ( _sections.at(i).startIndex().row() < itemRow )
       return _sections.at(i);
   }
 
   static XQModelSection s_DummySection;
-
   return s_DummySection;
 
 }
@@ -156,14 +147,6 @@ const XQModelSection& XQSectionManager::createSection(const QString& sectionKey,
   return sectionByKey(sectionKey);
 }
 
-//! ermittelt die erste zeile einer section.
-
-/*
-int XQSectionManager::firstRow(const QModelIndex& idx) const
-{
-  return sectionByRow(idx.row() ).row();
-}
-*/
 
 //! ermittelt die zeile unterhalb des gegebenen modelindex,
 //! zum einfügen neuer items ebendort.
@@ -177,10 +160,11 @@ int XQSectionManager::lastRow(const QModelIndex& idx) const
 
 //! ermittelt die zeile unterhalb der gegebenen section,
 //! zum einfügen neuer items ebendort.
+*/
 
 int XQSectionManager::lastRow(const XQModelSection& section ) const
 {
-  //qDebug() << " -- last row in section: " << section.modelIndex.data().toString() << " --> " << section.modelIndex.row();
+  qDebug() << " -- last row in section: " << section.startIndex().data().toString() << " --> " << section.startIndex().row();
   // row() der section unterhalb dieser
   // __fix? index mit speichern?
   int index = _sections.indexOf(section);
@@ -188,23 +172,18 @@ int XQSectionManager::lastRow(const XQModelSection& section ) const
   {
     // last section? return last row of model
     if (index == _sections.size() - 1)
-      return section.persistentModelIndex().model()->rowCount();// - 1;
+      return section.startIndex().model()->rowCount() - 1;
     // return row above the row of the next section -> last row of given section
-    return _sections.at(index+1).row();
+    return _sections.at(index+1).firstRow() - 1;
   }
   return -1;
 }
-*/
 
-/*
-  int firstRow(const QModelIndex& idx) const;
-  int lastRow(const QModelIndex& idx) const;
-  int lastRow(const XQModelSection& section) const;
-  */
 
-XQSectionPos XQSectionManager::sectionPos()
+XQSectionRange XQSectionManager::sectionRange(const XQModelSection& section ) const
 {
-  return XQSectionPos();
+  qDebug() << " ---- Section RANGE: " << section.startIndex().row() << "  -> " << lastRow(section);
+  return XQSectionRange{ section.startIndex().row(), lastRow(section) };
 }
 
 
@@ -215,7 +194,7 @@ void XQSectionManager::dump() const
   qDebug() << " --- sections dump(): " <<_sections.size() << " entries.";
   for( int i = 0; i<_sections.size(); ++i )
   {
-    QModelIndex idx = _sections.at(i).persistentModelIndex();
+    QModelIndex idx = _sections.at(i).startIndex();
     qDebug() << " --- sections:" << i << "row: " << idx.row() << " keyOf(i): " << _sections.keyOf(i) << " indexData: "<< idx.data().toString() << " itemData: " << XQItem::xqItemFromIndex(idx).data(Qt::DisplayRole).toString();
   }
 
diff --git a/src/model/xqsectionmanager.h b/src/model/xqsectionmanager.h
index 9db755b..686dacb 100644
--- a/src/model/xqsectionmanager.h
+++ b/src/model/xqsectionmanager.h
@@ -36,9 +36,9 @@ public:
 
   bool operator==(const XQModelSection& other) const;
   bool isValid() const;
-  int row() const;
+  int  firstRow() const;
 
-  QModelIndex        persistentModelIndex() const;
+  QModelIndex        startIndex() const;
   XQNodePtr          sectionRootNode() const;
   XQNodePtr          sheetRootNode() const;
   XQNodePtr          contentRootNode() const;
@@ -59,7 +59,7 @@ protected:
 Q_DECLARE_METATYPE(XQModelSection)
 
 //!  Erste und letzte ziele einer XQModelSection
-struct XQSectionPos
+struct XQSectionRange
 {
   int firstRow{-1};
   int lastRow{-1};
@@ -74,19 +74,12 @@ public:
 
   bool  hasValidSection(const QString& sectionKey) const;
 
-  const XQModelSection& sectionByKey( const QString& sectionKey );
+  const XQModelSection& sectionByKey( const QString& sectionKey ) const;
   const XQModelSection& sectionByRow( int row ) const;
-  const XQModelSection& sectionByIndex( const QModelIndex& index ) const;
 
   const XQModelSection& createSection(const QString& sectionKey, const QModelIndex& modelIndex, XQNodePtr sheetNode);
-
-  /*
-  int firstRow(const QModelIndex& idx) const;
-  int lastRow(const QModelIndex& idx) const;
-  int lastRow(const XQModelSection& section) const;
-  */
-
-  XQSectionPos sectionPos();
+  int                   lastRow(const XQModelSection& section ) const;
+  XQSectionRange        sectionRange(const XQModelSection &section) const;
 
   void dump()const;
 
diff --git a/src/model/xqviewmodel.cpp b/src/model/xqviewmodel.cpp
index 967b323..14ee63f 100644
--- a/src/model/xqviewmodel.cpp
+++ b/src/model/xqviewmodel.cpp
@@ -175,24 +175,33 @@ void XQViewModel::addSection(const XQItemList& list, const XQNodePtr& sectionNod
 }
 
 
+//! SLOT, toggled die section mit dem 'sectionKey' (hier: contentType)
+
 void XQViewModel::onToggleSection(const QString& sectionKey )
 {
-  qDebug() << " --- onToggleSection: " << sectionKey;
-  if( _sections.hasValidSection( sectionKey ) && _treeTable )
-  {
-    //const XQModelSection& section =_sections.sectionByKey(sectionKey);
+  toggleSection( _sections.sectionByKey(sectionKey) );
+}
 
+
+//! toggled die gegebene model section.
+
+void XQViewModel::toggleSection( const XQModelSection& section )
+{
+  qDebug() << " --- toggleSection: " << section.contentType();
+  if( section.isValid() && _treeTable )
+  {
+    XQSectionRange pos = _sections.sectionRange(section);
     //int fstRow = _sections.firstRow(index);
     //int lstRow = _sections.lastRow(index);
     //_treeTable->toggleRowsHidden(fstRow, lstRow);
 
+    // hier nicht!?
     //emit sectionToggled(section);
+
   }
-
 }
 
 
-
 /*
 //! SLOT als weiterleitung vom SIGNAL itemchanged
 
@@ -463,7 +472,7 @@ void XQViewModel::cmdNew( const XQCommand& command )
 
 
   //...
-  const XQModelSection& section = _sections.sectionByIndex( origin );
+  const XQModelSection& section = _sections.sectionByRow( origin.row() );
 
   // neue, leere zeile erzeugen ...
   XQItemList list =_itemFactory.makeRow( section.sheetRootNode(), newNode );
@@ -489,14 +498,13 @@ void XQViewModel::cmdNewUndo( const XQCommand& command )
 
 //! schaltet eine section sichtbar oder unsichtbar.
 
-/*
 void XQViewModel::cmdToggleSection( const XQCommand& command )
 {
   const QModelIndex& index = command.originIndex();
   Q_ASSERT(index.isValid());
-  toggleSection( _sections.sectionByIndex(index) );
+  toggleSection( _sections.sectionByRow(index.row()) );
 }
-*/
+
 
 //! gibt die treetable zurück
 
diff --git a/src/model/xqviewmodel.h b/src/model/xqviewmodel.h
index 20db1f0..128babb 100644
--- a/src/model/xqviewmodel.h
+++ b/src/model/xqviewmodel.h
@@ -55,7 +55,7 @@ public:
   virtual void initModel( const QString& modelName);
 
   void expandNewItem(const QModelIndex& index);
-  void toggleSection( const QString& sectionKey );
+  void toggleSection( const XQModelSection& section );
 
   //little helpers
   const XQItem& xqRootItem();
@@ -66,7 +66,7 @@ public:
 
   // undo-/redo-able stuff
 
-  //virtual void cmdToggleSection( const XQCommand& command );
+  virtual void cmdToggleSection( const XQCommand& command );
   virtual void cmdCut( const XQCommand& command );
   virtual void cmdCutUndo( const XQCommand& command );
   virtual void cmdPaste( const XQCommand& command );
@@ -91,13 +91,10 @@ public slots:
   virtual void onShowContextMenu(const QPoint& point);
   virtual void onActionTriggered(QAction* action);
   virtual void onToggleSection(const QString& sectionKey );
-
   // handle XQCommands ( == UndoCommand )
   virtual void onCommandRedo( const XQCommand& command );
   virtual void onCommandUndo( const XQCommand& command );
 
-
-
 protected:
 
   void addSection(const XQItemList& list, const XQNodePtr& sheetNode );
diff --git a/src/widgets/xqcontextmenu.cpp b/src/widgets/xqcontextmenu.cpp
index 316fdab..4c8a562 100644
--- a/src/widgets/xqcontextmenu.cpp
+++ b/src/widgets/xqcontextmenu.cpp
@@ -31,7 +31,7 @@ void XQContextMenu::addAction(const QString& text, XQCommand::CmdType commandTyp
   QAction* newAction = new QAction(text, this);
   newAction->setData(commandType);
   _actionMap[commandType] = newAction;
-  QWidget::addAction(newAction);
+  QMenu::addAction(newAction);
   setActionEnabled( commandType, enabled );
 }
 
@@ -53,7 +53,7 @@ void XQContextMenu::addAction(const QIcon& icon, const QString& text, XQCommand:
   QAction* newAction = new QAction(icon, text, this);
   newAction->setData(commandType);
   _actionMap[commandType] = newAction;
-  QWidget::addAction(newAction);
+  QMenu::addAction(newAction);
   setActionEnabled( commandType, enabled );
 }