diff --git a/CampusAppWP8/CampusAppWP8/Pages/Campusmap/RoomListPage.xaml.cs b/CampusAppWP8/CampusAppWP8/Pages/Campusmap/RoomListPage.xaml.cs
index 074b1529..69fb12ef 100644
--- a/CampusAppWP8/CampusAppWP8/Pages/Campusmap/RoomListPage.xaml.cs
+++ b/CampusAppWP8/CampusAppWP8/Pages/Campusmap/RoomListPage.xaml.cs
@@ -420,14 +420,26 @@ namespace CampusAppWP8.Pages.Campusmap
 
         #endregion
 
+        /// <summary> Event handler. Called by ZoomIn for tap events. </summary>
+        /// <remarks> Fiedler, 15.11.2013. </remarks>
+        /// <param name="sender"> Source of the event. </param>
+        /// <param name="e">      Gesture event information. </param>
         private void ZoomIn_Tap(object sender, System.Windows.Input.GestureEventArgs e)
         {
-            throw new NotImplementedException("TODO");
+            //throw new NotImplementedException("TODO");
+            (this.MapCanvas.RenderTransform as ScaleTransform).ScaleX *= 1.5;
+            (this.MapCanvas.RenderTransform as ScaleTransform).ScaleY *= 1.5;
         }
 
+        /// <summary> Event handler. Called by ZoomOut for tap events. </summary>
+        /// <remarks> Fiedler, 15.11.2013. </remarks>
+        /// <param name="sender"> Source of the event. </param>
+        /// <param name="e">      Gesture event information. </param>
         private void ZoomOut_Tap(object sender, System.Windows.Input.GestureEventArgs e)
         {
-            throw new NotImplementedException("TODO");
+            //throw new NotImplementedException("TODO");
+            (this.MapCanvas.RenderTransform as ScaleTransform).ScaleX /= 1.5;
+            (this.MapCanvas.RenderTransform as ScaleTransform).ScaleY /= 1.5;
         }
 
         #endregion