试图了解如何在运行时访问选项卡上的控件

这里的新手；我正在尝试将我的VB程序移植到Tabs中运行。到目前为止，我一直在尝试使用添加的控件在运行时创建选项卡。我发现我可以在FormLoad（）或通过执行按钮创建选项卡并添加控件。但是，一旦创建了选项卡，我就无法访问这些控件。我无法从创建的选项卡之外的组合框、文本框中获取任何信息。下面是一个简单的程序，我设法将其组合在一起：

公共类Form1继承FormPrivate tabControl1作为TabControlPrivate tabPage1作为TabPagePrivate tabPage2作为TabPageDim nm作为字符串

Private Sub MyTabs()
    Me.tabControl1 = New TabControl()
    Me.tabPage1 = New TabPage()
    Me.tabPage2 = New TabPage()
    Dim txtBox1 As New Windows.Forms.TextBox With {.Parent = tabPage1}
    Dim CalcButton As New Windows.Forms.Button With {.Parent = tabPage1}

    CalcButton.Location = New Point(1572, 150)
    CalcButton.Size = New Point(100, 50)
    CalcButton.Text = "CALCULATE"

    txtBox1.Location = New Point(1572, 258)
    txtBox1.Size = New Point(70, 22)
    txtBox1.Name = "Loc_num"
    txtBox1.Text = "1"

    nm = txtBox1.Text

    Me.tabControl1.Controls.AddRange(New Control() {Me.tabPage1, Me.tabPage2})
    Me.tabControl1.Padding = New Point(15, 10)
    Me.tabControl1.Location = New Point(35, 25)
    Me.tabControl1.Size = New Size(1800, 750)

    ' Selects tabPage1 using SelectedTab
    Me.tabControl1.SelectedTab = tabPage1

    Me.tabPage1.Text = "tabPage1"
    Me.tabPage2.Text = "tabPage2"

    Me.Size = New Size(2000, 900)
    Me.Controls.AddRange(New Control() {Me.tabControl1})

    AddHandler CalcButton.Click, AddressOf CalcButton_Click

End Sub
Private Sub CalcButton_Click()
    Dim xx As Integer
    Me.tabControl1.SelectedTab = tabPage1

    xx = Convert.ToInt32(nm) ' IT KEEPS SHOWING A 1, EVENTHOU I CHANGED IT TO 4 WHEN FORM LOADS
    MessageBox.Show(nm)

End Sub
Public Sub New()
    MyTabs()
End Sub

Public Sub Main()
    Application.Run(New Form1())
End Sub

结束类我不确定是否可以继续此路径感谢任何帮助或评论