diff --git a/tests/gui/test/mock-elm.hpp b/tests/gui/test/mock-elm.hpp
index 7489534bb..b0cec0865 100644
--- a/tests/gui/test/mock-elm.hpp
+++ b/tests/gui/test/mock-elm.hpp
@@ -142,13 +142,7 @@ namespace test{
       doExpand (bool yes)  override
         {
           log_.call(this->identify(), "expand", yes);
-          if (expanded_ == yes)
-            return false; // nothing to change
-          
-          virgin_ = false;
-          expanded_ = yes;
-          log_.event (expanded_? "expanded" : "collapsed");
-          return true; // record a state change
+          return Tangible::doExpand (yes);
         }
       
       virtual void
@@ -317,6 +311,13 @@ namespace test{
         {
           log_.call (this->identify(), "ctor", identity, string(nexus));
           log_.create (getID().getSym());
+          installExpander ([&](){ return this->expanded_; }
+                          ,[&](bool yes)
+                                {
+                                  virgin_ = false;
+                                  expanded_ = yes;
+                                  log_.event (expanded_? "expanded" : "collapsed");
+                                });
         }
       
       
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 31decc366..7a744cd16 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -1943,13 +1943,21 @@
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1535725923421" ID="ID_298871659" MODIFIED="1535725936028" TEXT="Expander geeignet verdrahten">
 <icon BUILTIN="flag-yellow"/>
-<node CREATED="1535725940226" ID="ID_162482468" MODIFIED="1535725949205" TEXT="validiert das Design"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1535743705113" ID="ID_54369760" MODIFIED="1535743721369" TEXT="auch MockElm anpassen">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#435e98" CREATED="1535725940226" ID="ID_162482468" MODIFIED="1535750016792" TEXT="validiert das Design">
+<icon BUILTIN="yes"/>
+</node>
+<node COLOR="#338800" CREATED="1535743705113" ID="ID_54369760" MODIFIED="1535749999498" TEXT="auch MockElm anpassen">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1535737902126" ID="ID_1001984094" MODIFIED="1535737905991" TEXT="Unit-Test">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1535737902126" ID="ID_1001984094" MODIFIED="1535750031727" TEXT="Unit-Test">
+<icon BUILTIN="button_ok"/>
+<node CREATED="1535750033829" ID="ID_1808097547" MODIFIED="1535750109787" TEXT="AbstractTangible_test::markState()">
+<icon BUILTIN="button_ok"/>
+</node>
+<node CREATED="1535750110787" ID="ID_1169665466" MODIFIED="1535750125766" TEXT="tested implizit die neue default-Implementierung mit">
+<icon BUILTIN="idea"/>
+</node>
 </node>
 </node>
 </node>