diff --git a/src/application/xqchildmodel.cpp b/src/application/xqchildmodel.cpp
index 658ad21..ebcf41f 100644
--- a/src/application/xqchildmodel.cpp
+++ b/src/application/xqchildmodel.cpp
@@ -77,14 +77,6 @@ void XQChildModel::addModelData( const XQNodePtr& contentRoot )
 }
 
 
-//! SLOT als weiterleitung vom SIGNAL itemchanged
-
-void XQChildModel::onItemChanged(XQItem& item )
-{
-  qDebug() << " --- Child item changed: " << item.text();
-}
-
-
 //! Erzeugt eine model-section und fügt den zugehörigen header ein.
 
 void XQChildModel::addSectionEntry( const QString& key, const XQNodePtr& contentEntry )
diff --git a/src/application/xqchildmodel.h b/src/application/xqchildmodel.h
index 3819e3b..d98d88e 100644
--- a/src/application/xqchildmodel.h
+++ b/src/application/xqchildmodel.h
@@ -32,10 +32,6 @@ public:
   void addModelData(const XQNodePtr& contentRoot );
   void addSectionEntry(const QString& key, const XQNodePtr& contentEntry );
 
-//public slots:
-
-  void onItemChanged( XQItem& item ) override;
-
 protected:
 
   //void setupViewProperties() override;
diff --git a/src/application/xqmainmodel.cpp b/src/application/xqmainmodel.cpp
index ca37b44..fcebe68 100644
--- a/src/application/xqmainmodel.cpp
+++ b/src/application/xqmainmodel.cpp
@@ -79,9 +79,3 @@ void XQMainModel::addSectionItem( const XQModelSection& section, XQItem* project
 }
 
 
-
-void XQMainModel::onItemChanged( XQItem& item )
-{
-  qDebug() << " --- MAIN Model on itemChanged:"  << item.text();
-
-}
diff --git a/src/application/xqmainmodel.h b/src/application/xqmainmodel.h
index a5339fc..7504f80 100644
--- a/src/application/xqmainmodel.h
+++ b/src/application/xqmainmodel.h
@@ -36,11 +36,6 @@ public:
   void    addSectionItem( const XQModelSection& section, XQItem* projectItem );
 
 
-//public slots:
-
-  void onItemChanged(XQItem& item ) override;
-
-
 protected:
 
   void initContextMenu() override;
diff --git a/src/application/xqmainwindow.cpp b/src/application/xqmainwindow.cpp
index 68573c1..cd36d4d 100644
--- a/src/application/xqmainwindow.cpp
+++ b/src/application/xqmainwindow.cpp
@@ -88,29 +88,19 @@ void XQMainWindow::initMainWindow()
   connect( _actionExit,   &QAction::triggered, this, &XQMainWindow::onExit );
   connect( _actionAbout,  &QAction::triggered, this, &XQMainWindow::onAbout );
 
-  connect( _tabWidget,    SIGNAL(tabBarClicked(int)),    this, SLOT(onTabClicked(int)) );
+  connect( _tabWidget,    SIGNAL(tabBarClicked(int)),    this, SLOT(onChildViewTabClicked(int)) );
 
   //connect(&_mainModel, &QStandardItemModel::itemChanged, this, &XQMainWindow::onTreeItemChanged );
   //connect( _mainTreeView, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(onDoubleClicked(QModelIndex)) );
   //connect( _mainTreeView, SIGNAL(clicked(QModelIndex)),  this, SLOT(onTreeItemClicked(QModelIndex)) );
-  /*
-  connect( _mainTreeView, &QTreeView::clicked, this, [&,this](const QModelIndex& index)
-  {
-    onTreeItemClicked( XQItem::xqItemFromIndex(index) );
-  });
-  */
+
+  connect(&_mainModel, &XQViewModel::xqItemChanged, this, &XQMainWindow::onTreeViewItemChanged );
 
   connect( _mainTreeView, &QTreeView::clicked, this, [&,this](const QModelIndex& index)
   {
-    onMyFirz( XQItem::xqItemFromIndex(index) );
+    onChildViewItemClicked( XQItem::xqItemFromIndex(index) );
   });
 
-  connect( this, &XQMainWindow::doTheFirz, this, &XQMainWindow::onMyFirz );
-
-  XQItem* item = new XQItem();
-  item->setText("xxxFITZ!");
-
-  emit doTheFirz(*item);
 
   /*
   connect( &_mainModel, &XQViewModel::itemCreated, this, [=, this](XQItem* item)
@@ -267,7 +257,7 @@ void XQMainWindow::onAbout()
 //! wenn ein item im navigations-baum geklickt wird, soll die document
 //! view rechts angepasst werden.
 
-void XQMainWindow::onTreeItemClicked( XQItem& item )
+void XQMainWindow::onTreeViewItemClicked( const XQItem& item )
 {
 
   qDebug() << " --- XXX mainWindow onTreeItemClicked:" << item.text();
@@ -285,17 +275,17 @@ void XQMainWindow::onTreeItemClicked( XQItem& item )
   }
 }
 
-void XQMainWindow::onTreeItemChanged(XQItem& item )
+void XQMainWindow::onTreeViewItemChanged(const XQItem &item )
 {
   qDebug() << " --- MAIN WINDOW on itemChanged:"  << item.text();
 }
 
-void XQMainWindow::onChildViewItemClicked( XQItem& item )
+void XQMainWindow::onChildViewItemClicked( const XQItem& item )
 {
   qDebug() << " --- MAIN WINDOW on CHILD item CLICK:"  << item.text();
 }
 
-void XQMainWindow::onChildViewItemChanged( XQItem& item )
+void XQMainWindow::onChildViewItemChanged(const XQItem &item )
 {
     qDebug() << " --- MAIN WINDOW on CHILD itemChanged:"  << item.text();
 }
@@ -303,8 +293,9 @@ void XQMainWindow::onChildViewItemChanged( XQItem& item )
 
 //! beim click auf ein tab im linken fenster wird der navigationsbaum angepasst.
 
-void XQMainWindow::onTabClicked( int index )
+void XQMainWindow::onChildViewTabClicked( int index )
 {
+  qDebug() << " --- onChildTabClicked: "  << index;
   //const QString& key = _documentStore[index].treeItem->attribute( c_ProjectID );
   //qDebug() << " ---- tab clicked: " << index  << " : " << _documentStore[index].friendlyName;// << ": " << key;
   //_mainTreeView->setCurrentIndex( _documentStore[index]->treeTtem.index() );
diff --git a/src/application/xqmainwindow.h b/src/application/xqmainwindow.h
index 4169b16..1fbfbb9 100644
--- a/src/application/xqmainwindow.h
+++ b/src/application/xqmainwindow.h
@@ -33,10 +33,6 @@ public:
 
   void initMainWindow();
 
-signals:
-
-  void doTheFirz(XQItem& item);
-
 public slots:
 
   virtual void onMyFirz(XQItem& item)
@@ -55,11 +51,12 @@ public slots:
   void onAbout();
   void onExit();
 
-  void onTreeItemClicked( XQItem& item );
-  void onTreeItemChanged( XQItem& item );
-  void onChildViewItemClicked( XQItem& item );
-  void onChildViewItemChanged( XQItem& item );
-  void onTabClicked( int index );
+  void onTreeViewItemClicked(const XQItem& item );
+  void onTreeViewItemChanged( const XQItem& item );
+  void onChildViewItemClicked( const XQItem& item );
+  void onChildViewItemChanged( const XQItem& item );
+  void onChildViewTabClicked( int index );
+
   //void onItemCreated( XQItem* item );
   void onSectionCreated( const XQModelSection& section);
   void onSectionToggled( const XQModelSection& section );
diff --git a/src/model/xqviewmodel.cpp b/src/model/xqviewmodel.cpp
index 6ed39e6..6e5114b 100644
--- a/src/model/xqviewmodel.cpp
+++ b/src/model/xqviewmodel.cpp
@@ -47,14 +47,14 @@ XQViewModel::XQViewModel( QObject* parent )
 {
   invisibleRootItem()->setData( "[rootItem]", Qt::DisplayRole );
   setItemPrototype( new XQItem );
-  /*
+
   // auf änderungen kann in den unterklassen reagiert werden
   connect(this, &QStandardItemModel::itemChanged, this, [this](QStandardItem *item)
   {
     XQItem* xqItem = static_cast<XQItem*>(item);
-    onItemChanged( *xqItem );
+    emit xqItemChanged( *xqItem );
   });
-  */
+
 
   //qRegisterMetaType<XQItem>("XQItem");
 }
@@ -171,22 +171,6 @@ void XQViewModel::addSection(const XQItemList& list, const XQNodePtr& sectionNod
 void XQViewModel::onToggleSection(const QString& sectionKey )
 {
   qDebug() << " --- onToggleSection: " << sectionKey;
-  /*
-
-  connect(model, &QStandardItemModel::dataChanged, this, &YourClass::onItemChanged);
-
-void YourClass::onItemChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles)
-{
-    if (roles.contains(Qt::CheckStateRole)) {
-        Qt::CheckState state = static_cast<Qt::CheckState>(topLeft.data(Qt::CheckStateRole).toInt());
-        if (state == Qt::Checked) {
-            qDebug() << "Checkbox wurde aktiviert!";
-            // Hier kannst du dein QObject benachrichtigen
-        }
-    }
-}
-*/
-
 }
 
 /*
diff --git a/src/model/xqviewmodel.h b/src/model/xqviewmodel.h
index 808bb38..95ec3b5 100644
--- a/src/model/xqviewmodel.h
+++ b/src/model/xqviewmodel.h
@@ -95,8 +95,9 @@ public:
 
   */
 
+signals:
 
-  virtual void onItemChanged( XQItem& item ) = 0;
+  void xqItemChanged( const XQItem& item );
 
 public slots:
 
@@ -104,7 +105,6 @@ public slots:
   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 );