iOS Question ProgressView Image Background

Sub SetTrackImage(PV As ProgressView, Image As Bitmap)
    Dim NaObj As NativeObject = PV
    NaObj.RunMethod("setTrackImage:",Array(Image))
End Sub

Sub SetProgressImage(PV As ProgressView, Image As Bitmap)
    Dim NaObj As NativeObject = PV
    NaObj.RunMethod("setProgressImage:",Array(Image))
End Sub