diff --git a/libs/wxutil/VFSTreePopulator.h b/libs/wxutil/VFSTreePopulator.h
index 3e751fa767..64bc5625c3 100644
--- a/libs/wxutil/VFSTreePopulator.h
+++ b/libs/wxutil/VFSTreePopulator.h
@@ -83,6 +83,8 @@ class VFSTreePopulator
      * and cannot mix between these two, as this variant here does not keep track
      * of the "path-is-explicit" property and therefore doesn't support the
      * forEachNode() method being called with a Visitor.
+     *
+     * Note: the callback needs to invoke row.SendItemAdded() when done.
      */
     void addPath(const std::string& path, const ColumnPopulationCallback& func);
 
diff --git a/radiant/uimanager/SoundChooser.cpp b/radiant/uimanager/SoundChooser.cpp
index 3f60b435ed..f529a1d1d0 100644
--- a/radiant/uimanager/SoundChooser.cpp
+++ b/radiant/uimanager/SoundChooser.cpp
@@ -75,6 +75,7 @@ class SoundShaderPopulator :
                 wxDataViewIconText(leafName, isFolder ? _folderIcon : _shaderIcon));
             row[_columns.shaderName] = !isFolder ?  shader.getName() : std::string();
             row[_columns.isFolder] = isFolder;
+            row.SendItemAdded();
         });
     }
 };