Private bd1, bd2 As BitmapDrawable
Private bmp1, bmp2 As Bitmap
Private sd1 As StateListDrawable
bmp1.Initialize(File.DirAssets, "bmpChecked.bmp")
bmp2.Initialize(File.DirAssets, "bmpUnchecked.bmp")
bd1.Initialize(bmp1)
bd2.Initialize(bmp2)
sd1.Initialize
sd1.AddState(sd1.State_Checked, bd1)
sd1.AddState(sd1.State_Unchecked, bd2)
btnTest1.Background = sd1