主题：嵌套的窗口没有办法用enter切换控件

我设计了一个主窗口，在主窗口中打开订单窗口，订单窗口的几个textbox之间不能用enter键切换，单独打开订单窗口时没有问题，这是怎么回事？怎么才能使用enter切换

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点击浏览该文件:产品7.zip

Dim tab As WinForm.TabControl = e.Form.Controls("TabControl1")
If tab.TabPages("订单窗口" ) IsNot Nothing Then
    tab.SelectedPage = tab.TabPages("订单窗口")
Else
    Dim Name As String = "订单窗口"
    tab.TabPages.Add(name,name)
    Dim pb = tab.BaseControl
    Forms(Name).OPEN(-1000,-1500)
    Forms(Name).BaseForm.TopLevel = False
    Forms(Name).BaseForm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None
    Forms(Name).BaseForm.Dock = System.Windows.Forms.DockStyle.Fill
    PB.TabPages(name).Controls.Clear
    PB.TabPages(name).Controls.add(Forms(Name).BaseForm)
    tab.SelectedPage = tab.TabPages(name)
    tab.Select
    Sendkeys.Send("{tab}")
End If