Correct way to use Reflection to set a view parameter

Sub GetPanelFormat(pnl As Panel, pnlType As String)
   Dim gd As GradientDrawable
   Dim rfl1 As Reflector
   Dim arColor(2) As Int

   Select pnlType
      Case "input"
         arColor(0) = Colors.Blue
         arColor(1) = Colors.White
         gd.Initialize("LEFT_RIGHT",arColor )
         gd.CornerRadius = 20dip
         rfl1.Target = gd

'      THEN, CHANGE THE GRADIENT TYPE FROM THE DEFAULT LINEAR TO RECTANGLE

'      EXAMPLES of Reflector.RunMethod attemps that failed. Error message something like "NO METHOD FOUND".

'      rfl1.RunMethod("setGradientType(RECTANGLE)")
'      rfl1.RunMethod("GradientDrawable.setGradientType(RECTANGLE)")
'      rfl1.RunMethod("android.graphics.drawable.GradientDrawable$setGradientType(RECTANGLE)")
'      rfl1.RunMethod("android.graphics.drawable.GradientDrawable.setGradientType(RECTANGLE)")
'      rfl1.RunMethod("android.graphics.drawable.setGradientType(RECTANGLE)")

'      I picked "RunMethod" as the best way to implement a GET or SET method but I may be way off.
'      I mostly expect that I do not understand how to read Andrew's documentation and I am messing up the
'      parameters (i.e., "method as String" parameter).
   
         pnl.Background = gd

      Case "help"
         arColor(0) = Colors.Red
         arColor(1) = Colors.White
         gd.Initialize("LEFT_RIGHT",arColor )
         gd.CornerRadius = 10dip
         rfl1.Target = gd

'         CHANGE THE GRADIENT TYPE FROM THE DEFAULT LINEAR TO RECTANGLE

         pnl.Background = gd

      Case Else
         pnl.Color = Colors.Black
   End Select
End Sub