diff --git a/components/tvplanit/source/vpedfmtlst.pas b/components/tvplanit/source/vpedfmtlst.pas
index 9c0ad6feb..3b8e6e650 100644
--- a/components/tvplanit/source/vpedfmtlst.pas
+++ b/components/tvplanit/source/vpedfmtlst.pas
@@ -258,7 +258,7 @@ begin
     Prn.CurFormat := fmtIdx;
     UpdatePreview;
   end else
-    ; // to do: clear preview
+    PrintPreview.ForceUpdate;
   EnableFormatButtons(true);
   EnableElementButtons(true);
 end;