converting bitmap to an icon

I want to assign the Icon property (THIS-OBJECT:Icon) of a form at run time.

The method GetStoredImage below returns a System.Drawing.Image but I get an assigment type mismatch error when I assign the return value to the Icon prop.

Any ideas on how to do this?

  METHOD PUBLIC System.Drawing.Image GetStoredImage
        ( cImageType AS CHARACTER,
          cImageName AS CHARACTER ):
       
        DEFINE VARIABLE curImage AS System.Drawing.Image NO-UNDO.
        DEFINE VARIABLE cTmpchar AS CHARACTER NO-UNDO.
       
        cTmpChar = STRING(cImageType + "|" + cImageName).
       
        curImage =
            CAST(ImageListCollection:Item[cTmpChar],System.Drawing.Image)
            NO-ERROR.
        IF VALID-OBJECT(curImage) THEN
            RETURN curImage.
        ELSE
            RETURN ImageDefault.
       
  END METHOD. /* GetStoredImage */