Android Question ScrollView Edge properies

Sub Activity_Create(FirstTime As Boolean)
   Activity.LoadLayout("1")
   Dim cd As ColorDrawable
   cd.Initialize(Colors.Yellow, 10dip)
   SetThumbColor(ScrollView1, cd)
End Sub

Private Sub SetThumbColor(sv As ScrollView, drawable As Object)
   Try
     Dim r As Reflector
     r.Target = sv
     r.Target = r.GetField("mScrollCache")
     r.Target = r.GetField("scrollBar")
     r.RunMethod4("setVerticalThumbDrawable", Array(drawable), Array As String("android.graphics.drawable.Drawable"))
   Catch
     Log("SetThumbColor not supported.")   
   End Try
End Sub