diff --git a/src/proc/control/command-instance-manager.hpp b/src/proc/control/command-instance-manager.hpp
index 9ed568f46..4212bce3a 100644
--- a/src/proc/control/command-instance-manager.hpp
+++ b/src/proc/control/command-instance-manager.hpp
@@ -87,6 +87,7 @@ namespace control {
      ~CommandInstanceManager();
       
       Symbol newInstance (Symbol prototypeID, string invocationID);
+      Command& getInstance(Symbol instanceID);
       void dispatch (Symbol instanceID);
       
       bool contains (Symbol instanceID)  const;
diff --git a/src/proc/control/command-setup.cpp b/src/proc/control/command-setup.cpp
index 170b7e893..dd69cbf02 100644
--- a/src/proc/control/command-setup.cpp
+++ b/src/proc/control/command-setup.cpp
@@ -54,6 +54,7 @@ using lib::Symbol;
 using lumiera::LifecycleHook;
 using lumiera::ON_GLOBAL_INIT;
 using std::string;
+using util::unConst;
 using util::_Fmt;
 
 
@@ -175,6 +176,18 @@ namespace control {
   }
   
   
+  Command&
+  CommandInstanceManager::getInstance (Symbol instanceID)
+  {
+    Command& instance = table_[instanceID];
+    if (not instance)
+      throw error::Invalid (_Fmt{"Command instance '%s' is not (yet/anymore) active"}
+                                % instanceID
+                           , LUMIERA_ERROR_INVALID_COMMAND);
+    return instance;
+  }
+  
+  
   /** */
   void
   CommandInstanceManager::dispatch (Symbol instanceID)
@@ -184,7 +197,7 @@ namespace control {
       throw error::Logic (_Fmt{"attempt to dispatch command instance '%s' "
                                "without creating a new instance from prototype beforehand"}
                               % instanceID
-                         , LUMIERA_ERROR_INVALID_COMMAND);
+                         , error::LUMIERA_ERROR_LIFECYCLE);
     if (not instance.canExec())
       throw error::State (_Fmt{"attempt to dispatch command instance '%s' "
                                "without binding all arguments properly beforehand"}
@@ -193,14 +206,15 @@ namespace control {
     
     REQUIRE (instance and instance.canExec());
     dispatcher_.enqueue(move (instance));
-    ENSURE (not instance);
+    instance.close();
   }
   
   
   bool
   CommandInstanceManager::contains (Symbol instanceID)  const
   {
-    return util::contains (table_, instanceID);
+    return util::contains (table_, instanceID)
+       and unConst(this)->table_[instanceID].isValid();
   }
   
   
diff --git a/tests/core/proc/control/command-instance-manager-test.cpp b/tests/core/proc/control/command-instance-manager-test.cpp
index 974fcc82d..a1dcd573d 100644
--- a/tests/core/proc/control/command-instance-manager-test.cpp
+++ b/tests/core/proc/control/command-instance-manager-test.cpp
@@ -119,19 +119,18 @@ namespace test {
           Fixture fixture;
           CommandInstanceManager iManager{fixture};
           Symbol instanceID = iManager.newInstance(COMMAND_PROTOTYPE, INVOCATION_ID);
-          CHECK (Command::defined(instanceID));
-          CHECK (not Command::canExec(instanceID));
           
-          Command cmd{instanceID};
+          Command cmd = iManager.getInstance(instanceID);
+          CHECK (cmd);
+          CHECK (not cmd.canExec());
+          
           cmd.bind(42);
-          CHECK (Command::canExec(instanceID));
+          CHECK (cmd.canExec());
           
           iManager.dispatch (instanceID);
           CHECK (not iManager.contains (instanceID));
           CHECK (fixture.contains (instanceID));
-          CHECK (Command::canExec(instanceID));
-#if false /////////////////////////////////////////////////////////////////////////////////////////////////////////////UNIMPLEMENTED :: TICKET #1089
-#endif    /////////////////////////////////////////////////////////////////////////////////////////////////////////////UNIMPLEMENTED :: TICKET #1089
+          VERIFY_ERROR (INVALID_COMMAND, iManager.getInstance (instanceID));
         }
     };
   
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 7921eb924..e5e93fa15 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -11714,6 +11714,46 @@
 <icon BUILTIN="forward"/>
 </node>
 </node>
+<node CREATED="1491008040105" ID="ID_662216926" MODIFIED="1491008043901" TEXT="Implementierung">
+<node COLOR="#338800" CREATED="1491008045936" ID="ID_1071153669" MODIFIED="1491008146180" TEXT="CommandInstanceManager_test">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1491008059366" ID="ID_1809405076" MODIFIED="1491008147195" TEXT="CommandInstanceManager">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1491008067046" ID="ID_1905446877" MODIFIED="1491008148076" TEXT="einfache Map-Impl">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1491008073989" ID="ID_1954195404" MODIFIED="1491008148995" TEXT="Symbol-Tabelle">
+<icon BUILTIN="button_ok"/>
+</node>
+<node CREATED="1491008079676" ID="ID_1262786130" MODIFIED="1491008142008" TEXT="Test">
+<icon BUILTIN="pencil"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1491008088699" ID="ID_1501876595" MODIFIED="1491008114361" TEXT="Basisfall l&#xe4;uft noch nicht">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      die Instanz kommt nicht in der Fixture-Queue an
+    </p>
+  </body>
+</html>
+</richcontent>
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1491008118695" ID="ID_1595821007" MODIFIED="1491008138125" TEXT="Invocation abdecken">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1491008124550" ID="ID_249252999" MODIFIED="1491008138788" TEXT="Duplikate abdecken">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1491008129165" ID="ID_118623494" MODIFIED="1491008139405" TEXT="Lebenszyklus-Fehler">
+<icon BUILTIN="flag-yellow"/>
+</node>
+</node>
+</node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1489191252503" ID="ID_1621107057" MODIFIED="1489191308469" TEXT="#1090 Command access for UI-Elements">
 <arrowlink COLOR="#758ba4" DESTINATION="ID_827179653" ENDARROW="Default" ENDINCLINATION="173;83;" ID="Arrow_ID_57938013" STARTARROW="None" STARTINCLINATION="550;-93;"/>