diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.cpp b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
index 6e5b546..88083e0 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.cpp
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
@@ -14,9 +14,11 @@
 
 
 
-ATBDeviceControllerPlugin::ATBDeviceControllerPlugin(QObject *parent) : QObject(parent),
+ATBDeviceControllerPlugin::ATBDeviceControllerPlugin(QObject *parent) :
     pluginState(PLUGIN_STATE::NOT_INITIALIZED)
 {
+    this->setParent(parent);
+
     this->pluginInfo = QString::fromUtf8(pluginInfoString.c_str());
 
     if (!this->private_loadCashAgentLib("")) {
diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.h b/src/ATBAPP/ATBDeviceControllerPlugin.h
index 7ffc9bd..3e36777 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.h
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.h
@@ -24,7 +24,7 @@ using namespace nsDeviceControllerInterface;
 
 class QSettings;
 
-class ATBDeviceControllerPlugin : public QObject,
+class ATBDeviceControllerPlugin :
         public DeviceControllerInterface
 {
     Q_OBJECT
@@ -75,33 +75,6 @@ public slots:
 
 
 signals:
-    void printTicketFinished(nsDeviceControllerInterface::RESULT_STATE resultState,
-                                     const QString & errorCode,
-                                     const QString & errorDescription);
-
-    void cashInputEvent(nsDeviceControllerInterface::RESULT_STATE resultState,
-                        nsDeviceControllerInterface::CASH_STATE cashState,
-                        const QString & newCashValue,
-                        const QString & errorCode,
-                        const QString & errorDescription);
-
-    void cashInputFinished(nsDeviceControllerInterface::RESULT_STATE resultState,
-                                     const QString & newCashValue,
-                                     const QString & errorCode,
-                                     const QString & errorDescription);
-
-    void requestModeSERVICE();
-    void requestModeIDLE();
-    void requestModeOOO();
-
-    void requestAccountResponse(const QHash<QString, QVariant> & accountData);
-
-
-
-    void Error(
-            const QString & errorCode,
-            const QString & errorDescription);
-
 
 
 
diff --git a/src/ATBAPP/DeviceControllerInterface.h b/src/ATBAPP/DeviceControllerInterface.h
index 094f2ad..72278ab 100644
--- a/src/ATBAPP/DeviceControllerInterface.h
+++ b/src/ATBAPP/DeviceControllerInterface.h
@@ -15,8 +15,10 @@ namespace nsDeviceControllerInterface {
 }
 
 
-class DeviceControllerInterface : public ATBAPPplugin
+class DeviceControllerInterface : public QObject
+                                , public ATBAPPplugin
 {
+    Q_OBJECT
     Q_INTERFACES(ATBAPPplugin)
 
 public:
@@ -71,19 +73,19 @@ public slots:
     virtual void onChangedProgramModeToOOO() = 0;
 
 signals:
-    virtual void printTicketFinished(nsDeviceControllerInterface::RESULT_STATE resultState,
+    void printTicketFinished(nsDeviceControllerInterface::RESULT_STATE resultState,
                                      const QString & errorCode,
-                                     const QString & errorDescription) = 0;
+                                     const QString & errorDescription);
 
     /**
      * emitted on e.g. a coin input
      */
-    virtual void cashInputEvent(nsDeviceControllerInterface::RESULT_STATE resultState,
+    void cashInputEvent(nsDeviceControllerInterface::RESULT_STATE resultState,
                                 nsDeviceControllerInterface::CASH_STATE cashState,
                                 const QString & newCashValue,
                                 /* additional variables? */
                                 const QString & errorCode,
-                                const QString & errorDescription) = 0;
+                                const QString & errorDescription);
 
     /**
      * emitted if cashInput has been stopped, e.g. in result to task requestStopCashInput():
@@ -91,32 +93,32 @@ signals:
      *  -> no cash input is possible
      *  -> coins are in cache
      */
-    virtual void cashInputFinished(nsDeviceControllerInterface::RESULT_STATE resultState,
+    void cashInputFinished(nsDeviceControllerInterface::RESULT_STATE resultState,
                                      const QString & newCashValue,
                                      /*  additional variables? */
                                      const QString & errorCode,
-                                     const QString & errorDescription) = 0;
+                                     const QString & errorDescription);
 
 
     /**
      * emitted e.g. if service door is opened
      */
-    virtual void requestModeSERVICE() = 0;
+    void requestModeSERVICE();
 
     /**
      * emitted e.g. if doors are closed
      */
-    virtual void requestModeIDLE() = 0;
+    void requestModeIDLE();
 
     /**
      * emitted e.g. on severe errors
      */
-    virtual void requestModeOOO() = 0;
+    void requestModeOOO();
 
     /**
      * emitted e.g. if service door is opened
      */
-    virtual void requestAccountResponse(const QHash<QString, QVariant> & accountData) = 0;
+    void requestAccountResponse(const QHash<QString, QVariant> & accountData);
 
     /**
      * emitted on error
@@ -126,10 +128,10 @@ signals:
      * -> send error event to ISMAS
      * -> ...
      */
-    virtual void Error(
+    void Error(
             /*  additional variables? */
             const QString & errorCode,
-            const QString & errorDescription) = 0;
+            const QString & errorDescription);
 
 };