diff --git a/src/gui/ctrl/elem-access-dir.hpp b/src/gui/ctrl/elem-access-dir.hpp
index c39028d65..32b1baa42 100644
--- a/src/gui/ctrl/elem-access-dir.hpp
+++ b/src/gui/ctrl/elem-access-dir.hpp
@@ -67,7 +67,6 @@ namespace ctrl{
    */
   class ElemAccessDir
     : public model::ElementAccess
-    , ::util::NonCopyable
     {
       WindowLocator& windowLoc_;
       PanelLocator& panelLoc_;
@@ -84,7 +83,7 @@ namespace ctrl{
       /* == ElementAccess interface == */
       
       RawResult
-      performAccessTo (UICoord, size_t limitCreation)  override
+      performAccessTo (UICoord const&, size_t limitCreation)  override
         {
           UNIMPLEMENTED ("implementation of access function based on real UI widgets");
         }
diff --git a/src/gui/model/element-access.hpp b/src/gui/model/element-access.hpp
index 684fdd55c..174f3fb5d 100644
--- a/src/gui/model/element-access.hpp
+++ b/src/gui/model/element-access.hpp
@@ -102,17 +102,17 @@ namespace model {
       /* == Access by Location == */
       
       template<class TAR>
-      Result<TAR&> access (UICoord destination);
+      Result<TAR&> access (UICoord const& destination);
       
       template<class TAR>
-      Result<TAR&> access_or_create (UICoord destination, size_t limitCreation = LUMIERA_MAX_ORDINAL_NUMBER);
+      Result<TAR&> access_or_create (UICoord const& destination, size_t limitCreation = LUMIERA_MAX_ORDINAL_NUMBER);
       
       
     protected:
       using RawResult = lib::Variant<Types<model::Tangible*, Gtk::Widget*>>;
       
       /** @internal drill down according to coordinates, maybe create element */
-      virtual RawResult performAccessTo (UICoord, size_t limitCreation)      =0;
+      virtual RawResult performAccessTo (UICoord const&, size_t limitCreation)  =0;
       
     private:
       template<class TAR>
@@ -149,13 +149,13 @@ namespace model {
                                                      //   we know then the following dynamic_cast (downcast) can succeed  
       using Base = typename RawResult::FirstMatching<canUpcast>::Type;
       
-      void
-      accept (Base* pb)
+      virtual void
+      handle (Base& pb)  override
         {
           if (pb)
             result = *dynamic_cast<TAR*> (pb);
           else
-            result = "access returns empty answer";
+            result = Result<TAR&>{"access returns empty answer"};
         }
     };
   
@@ -174,7 +174,7 @@ namespace model {
    */
   template<class TAR>
   inline ElementAccess::Result<TAR&>
-  ElementAccess::access (UICoord destination)
+  ElementAccess::access (UICoord const& destination)
   {
     return access_or_create<TAR> (destination, 0);
   }
@@ -189,7 +189,7 @@ namespace model {
    */
   template<class TAR>
   inline ElementAccess::Result<TAR&>
-  ElementAccess::access_or_create (UICoord destination, size_t limitCreation)
+  ElementAccess::access_or_create (UICoord const& destination, size_t limitCreation)
   {
     TypeConverter<TAR> converter;
     RawResult targetElm = performAccessTo (destination, limitCreation);
diff --git a/tests/gui/test/test-element-access.hpp b/tests/gui/test/test-element-access.hpp
index 3709ad709..f575f5aa6 100644
--- a/tests/gui/test/test-element-access.hpp
+++ b/tests/gui/test/test-element-access.hpp
@@ -100,7 +100,7 @@ namespace test {
       /* == ElementAccess interface == */
       
       RawResult
-      performAccessTo (UICoord target, size_t limitCreation)  override
+      performAccessTo (UICoord const& target, size_t limitCreation)  override
         {
           CHECK (target == expectedQuery);
           return expectedAnswer;
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index c3cb059bf..8b47c68e3 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -12939,8 +12939,8 @@
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1523053336219" ID="ID_1234019560" MODIFIED="1523205867255" TEXT="ElementAccess_test">
 <linktarget COLOR="#43667c" DESTINATION="ID_1234019560" ENDARROW="Default" ENDINCLINATION="-338;-1489;" ID="Arrow_ID_839730277" SOURCE="ID_1539184761" STARTARROW="None" STARTINCLINATION="-530;453;"/>
 <icon BUILTIN="pencil"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1523118534675" ID="ID_669651266" MODIFIED="1523118659130" TEXT="Mock-Implementierung">
-<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1523118534675" ID="ID_669651266" MODIFIED="1523663819813" TEXT="Mock-Implementierung">
+<icon BUILTIN="pencil"/>
 <node CREATED="1523118577557" ID="ID_1246038265" MODIFIED="1523118589479" TEXT="Mock-Prinzip">
 <icon BUILTIN="help"/>
 <node CREATED="1523118591395" ID="ID_1571065062" MODIFIED="1523118636465" TEXT="vorgefertigter Response">
@@ -12954,11 +12954,16 @@
 <node CREATED="1523118613096" ID="ID_169844591" MODIFIED="1523118623074" TEXT="== Vorarbeit f&#xfc;r die sp&#xe4;tere Implementierung"/>
 </node>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1523663840577" ID="ID_1523982995" MODIFIED="1523663860831" TEXT="Mock-Widget-Erzeugung">
+<icon BUILTIN="flag-yellow"/>
+<node CREATED="1523663862182" ID="ID_937721725" MODIFIED="1523663879959" TEXT="besser in die Mock-Service-Impl verlegen"/>
+<node CREATED="1523663880731" ID="ID_1244735047" MODIFIED="1523663886894" TEXT="von dort nachpr&#xfc;fbar machen"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1523118660882" ID="ID_1452843558" MODIFIED="1523118677304" TEXT="Testf&#xe4;lle">
 <icon BUILTIN="flag-pink"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1523205670160" ID="ID_649704431" MODIFIED="1523205878512" TEXT="einfacher Zugriff auf existierendes Objekt">
-<icon BUILTIN="pencil"/>
+<node COLOR="#338800" CREATED="1523205670160" ID="ID_649704431" MODIFIED="1523663805752" TEXT="einfacher Zugriff auf existierendes Objekt">
+<icon BUILTIN="button_ok"/>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1523205706547" ID="ID_210608554" MODIFIED="1523205776609" TEXT="Zugriff auf Parent-Ebene, ein Kind-Knoten wird erzeugt">
 <icon BUILTIN="flag-yellow"/>