Не могу обратится к своему свойству формы TopMost

Option Strict On
 
Public Class Form1
 
    Private Button1 As Button
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Button1 = New Button With {.Location = New Point(10, 10), .Text = "Press"}
        AddHandler Button1.Click, AddressOf Button1_Click
        Me.Controls.Add(Button1)
 
        Form2.Show()
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Me.TopMost = Not (Me.TopMost)
 
        'так не работает
        'For Each f As Form In Me.OwnedForms
        '    MsgBox(f.ToString, Title:="Form1")
        '    f.TopMost = Me.TopMost
        'Next
 
        'так работает
        Form2.TopMost = Me.TopMost
    End Sub
End Class
 
Public Class Form2
    Inherits System.Windows.Forms.Form
 
    Public Overloads Property TopMost As Boolean
        'Public Shadows Property TopMost As Boolean
        Get
            Return MyBase.TopMost
        End Get
        Set(ByVal value As Boolean)
            MyBase.TopMost = value
            MsgBox("TopMost Property", Title:="Form2")
        End Set
    End Property
 
    Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.Owner = Form1
    End Sub
End Class