System.bool AddItemToThirdPartyPopupMenu2(

   System.int RegisterId,

   System.int DocType,

   System.string Item,

   System.int Identifier,

   System.string CallbackFunction,

   System.string EnableFunction,

   System.string CustomName,

   System.string HintString,

   System.string BitmapFileName,

   System.int MenuItemTypeOption

)

when i call this function the picture of icon not show up

in argument "System.string BitmapFileName" 
i try both png and bmp path for the image to icon

but it's not showing
any specific dimensions or extensions to make it works?

i try to read in API help but it's use image from embedded resources, i tried that one but still not working