UIImageListBoxImageListItem 构造函数 (Bitmap, String)

public ImageListItem(
	Bitmap image,
	string description = ""
)

Public Sub New ( 
	image As Bitmap,
	Optional description As String = ""
)

new : 
        image : Bitmap * 
        ?description : string 
(* Defaults:
        let _description = defaultArg description ""
*)
-> ImageListItem