diff --git a/src/gui/panel/timeline-panel.cpp b/src/gui/panel/timeline-panel.cpp
index e74a88647..5157647fe 100644
--- a/src/gui/panel/timeline-panel.cpp
+++ b/src/gui/panel/timeline-panel.cpp
@@ -102,9 +102,9 @@ namespace panel {
                   mem_fun(*this, &TimelinePanel::experiment_3));
       buttons_.add(button_3_);
       
-      button_4_.set_label("kill");
+      button_4_.set_label("_grow");
       button_4_.set_use_underline();
-      button_4_.set_tooltip_markup("<b>Experiment 4</b>:\nkill arbitrary child widget");
+      button_4_.set_tooltip_markup("<b>Experiment 4</b>:\nextend arbitrary child widget's text");
       button_4_.signal_clicked().connect(
                   mem_fun(*this, &TimelinePanel::experiment_4));
       buttons_.add(button_4_);
@@ -220,7 +220,10 @@ namespace panel {
   void
   TimelinePanel::experiment_4()
   {
-    frame_.set_label("Experiment 4...");
+    frame_.set_label("Experiment 4... GROW");
+    uint selector = rand() % childz_.size();
+    ChildEx& toGrow = *childz_[selector];
+    toGrow.set_label ("***"+toGrow.get_label()+"***");
   }
   
   
diff --git a/src/gui/panel/timeline-panel.hpp b/src/gui/panel/timeline-panel.hpp
index 2a278fe29..69ea9259f 100644
--- a/src/gui/panel/timeline-panel.hpp
+++ b/src/gui/panel/timeline-panel.hpp
@@ -83,7 +83,7 @@ namespace panel {
    *  6. bind some further signal(s) to the ~GtkLayout container
    *  7. hide and re-show a partially and a totally overlapped widget
    *  8. find a way to move a widget ✔ and delete arbitrary widgets ✔
-   *  9. expand an existing widget (text change)
+   *  9. expand an existing widget (text change) ✔
    *  10. build a custom "clip" widget
    *  11. retrofit all preceding tests to use this "clip" widget
    */
diff --git a/wiki/renderengine.html b/wiki/renderengine.html
index 5f1f65c47..16a55ba73 100644
--- a/wiki/renderengine.html
+++ b/wiki/renderengine.html
@@ -2635,7 +2635,7 @@ In the most general case, there can be per-track content and nested content at t
 &amp;rarr; important question: how to [[organise the widgets|GuiTimelineWidgetStructure]]
 </pre>
 </div>
-<div title="GuiTimelineWidgetStructure" creator="Ichthyostega" modifier="Ichthyostega" created="201410250002" modified="201610291551" tags="GuiPattern discuss decision impl" changecount="48">
+<div title="GuiTimelineWidgetStructure" creator="Ichthyostega" modifier="Ichthyostega" created="201410250002" modified="201610291617" tags="GuiPattern discuss decision impl" changecount="49">
 <pre>The Timeline is probably the most prominent place in the GUI where we need to come up with a custom UI design.
 Instead of combining standard components in one of the well-known ways, here we need to come up with our own handling solution -- which also means to write one or several custom GTK widgets. Thus the question of layout and screen space division and organisation becomes a crucial design decision. The ~GTK-2 Gui, as implemented currently, did already take some steps along this route, yet this kind of decision should be cast and documented explicitly (be it after the fact).
 
@@ -2706,6 +2706,8 @@ In order to build a sensible plan for our timeline structure, we need to investi
 :** the management of visible viewport within {{{Gtk::ScrolledWindow}}} is not correct (see [[ticket #1037|http://issues.lumiera.org/ticket/1037]])&lt;br/&gt;it does not account properly for the area covered by the scrollbars themselves
 ;moving child widgets
 :works as expected
+;expanding widgets
+:works ex expected
 ;delete child widgets
 :is possible by the {{{Container::remove(Widget*)}}} function
 :removed child widgets will also removed from display (hidden)
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 3bcd70e95..20f6ac27e 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -9406,9 +9406,10 @@
 <icon BUILTIN="button_ok"/>
 </node>
 </node>
-<node CREATED="1477595418670" ID="ID_1275908576" MODIFIED="1477596119218" TEXT="# expand an existing widget (text change)">
+<node CREATED="1477595418670" ID="ID_1275908576" MODIFIED="1477757749992" TEXT="# expand an existing widget (text change)">
 <font ITALIC="true" NAME="SansSerif" SIZE="12"/>
 <icon BUILTIN="full-9"/>
+<icon BUILTIN="button_ok"/>
 </node>
 <node CREATED="1477595418670" ID="ID_700977265" MODIFIED="1477596119218" TEXT="# build a custom &quot;&apos;&apos;clip&apos;&apos;&quot; widget">
 <font ITALIC="true" NAME="SansSerif" SIZE="12"/>