Private Sub ShowMyOwnedForm()
   ' Create an instance of the form to be owned.
   Dim ownedForm As New Form()
   ' Set the text of the form to identify it is an owned form.
   ownedForm.Text = "Owned Form"
   ' Add ownedForm to array of owned forms.
   Me.AddOwnedForm(ownedForm)

   ' Show the owned form.
   ownedForm.Show()
End Sub

' 导入命名空间
Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports System.ComponentModel

Public Class MainClass
    
    Shared Sub Main()
        Dim form1 As Form = New Form1

        Application.Run(form1)


    End Sub
End Class

Public Class OwnedForm
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents lblState As System.Windows.Forms.Label

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.lblState = New System.Windows.Forms.Label()
        Me.SuspendLayout()
        '
        'lblState
        '
        Me.lblState.Location = New System.Drawing.Point(12, 12)
        Me.lblState.Name = "lblState"
        Me.lblState.Size = New System.Drawing.Size(184, 56)
        Me.lblState.TabIndex = 0
        '
        'OwnedForm
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
        Me.ClientSize = New System.Drawing.Size(204, 78)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lblState})
        Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Name = "OwnedForm"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.Manual
        Me.Text = "Owned Form"
        Me.ResumeLayout(False)

    End Sub

#End Region


End Class


Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents cmdAddOwnership As System.Windows.Forms.Button
    Friend WithEvents cmdReleaseOwnership As System.Windows.Forms.Button

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents label1 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.cmdAddOwnership = New System.Windows.Forms.Button()
        Me.cmdReleaseOwnership = New System.Windows.Forms.Button()
        Me.label1 = New System.Windows.Forms.Label()
        Me.SuspendLayout()
        '
        'cmdAddOwnership
        '
        Me.cmdAddOwnership.FlatStyle = System.Windows.Forms.FlatStyle.System
        Me.cmdAddOwnership.Location = New System.Drawing.Point(12, 180)
        Me.cmdAddOwnership.Name = "cmdAddOwnership"
        Me.cmdAddOwnership.Size = New System.Drawing.Size(120, 32)
        Me.cmdAddOwnership.TabIndex = 0
        Me.cmdAddOwnership.Text = "Set Ownership"
        '
        'cmdReleaseOwnership
        '
        Me.cmdReleaseOwnership.FlatStyle = System.Windows.Forms.FlatStyle.System
        Me.cmdReleaseOwnership.Location = New System.Drawing.Point(148, 180)
        Me.cmdReleaseOwnership.Name = "cmdReleaseOwnership"
        Me.cmdReleaseOwnership.Size = New System.Drawing.Size(128, 32)
        Me.cmdReleaseOwnership.TabIndex = 1
        Me.cmdReleaseOwnership.Text = "Remove Ownership"
        '
        'label1
        '
        Me.label1.Location = New System.Drawing.Point(40, 32)
        Me.label1.Name = "label1"
        Me.label1.Size = New System.Drawing.Size(216, 80)
        Me.label1.TabIndex = 5
        Me.label1.Text = "Minimize to check the ownership."
        '
        'Owner
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
        Me.ClientSize = New System.Drawing.Size(288, 222)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.label1, Me.cmdReleaseOwnership, Me.cmdAddOwnership})
        Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Name = "Owner"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "Basic Form"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private frmOwned As New OwnedForm()

    Private Sub Owner_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.Show()
        frmOwned.Show()
    End Sub

    Private Sub cmdAddOwnership_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAddOwnership.Click
        Me.AddOwnedForm(frmOwned)
        frmOwned.lblState.Text = "I'm Owned"
    End Sub

    Private Sub cmdReleaseOwnership_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdReleaseOwnership.Click
        Me.RemoveOwnedForm(frmOwned)
        frmOwned.lblState.Text = "I'm Free!"
    End Sub
End Class