Невозможно добавить свой контрол при Framework 4.6.1

Public Class PlayButton
    Inherits Windows.Forms.Button
    Public Sub New()
        Me.FlatStyle = Windows.Forms.FlatStyle.Flat
        Me.FlatAppearance.BorderSize = 0
        Me.FlatAppearance.MouseDownBackColor = Color.Transparent
        Me.FlatAppearance.MouseOverBackColor = Color.Transparent
        Me.BackColor = Color.Transparent
        Me.BackgroundImage = My.Resources.forward1
        Me.BackgroundImageLayout = ImageLayout.Stretch
    End Sub
 
    Private Sub PlayButton_MouseDown(sender As Object, e As MouseEventArgs) Handles Me.MouseDown
        Me.BackgroundImage = My.Resources.forward_click
    End Sub
 
    Private Sub PlayButton_MouseHover(sender As Object, e As EventArgs) Handles Me.MouseHover
        Me.BackgroundImage = My.Resources.forward_hover
    End Sub
 
    Private Sub PlayButton_MouseLeave(sender As Object, e As EventArgs) Handles Me.MouseLeave
        Me.BackgroundImage = My.Resources.forward1
    End Sub
 
    Private Sub PlayButton_MouseUp(sender As Object, e As MouseEventArgs) Handles Me.MouseUp
        Me.BackgroundImage = My.Resources.forward1
    End Sub
End Class