diff --git a/lcl/extctrls.pp b/lcl/extctrls.pp
index 5104211446..e9c0db248d 100644
--- a/lcl/extctrls.pp
+++ b/lcl/extctrls.pp
@@ -621,6 +621,9 @@ type
     property OnMouseLeave;
     property OnMouseMove;
     property OnMouseUp;
+    property OnMouseWheel;
+    property OnMouseWheelDown;
+    property OnMouseWheelUp;
     property OnPaint;
     property OnPictureChanged;
     property OnResize;