主题：新建底层窗口

 停靠窗口这个的话，可以直接把独立窗口剪切到你的停靠窗口里去。

 类似

Dim tab As WinForm.TabControl = e.Form.Controls("TabControl1")
Dim Name As String = "窗口2"

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)

和basemainform没有任何关系的，如果要做mdi，你可以设置父子关系

http://www.foxtable.com/bbs/dispbbs.asp?BoardID=2&ID=16371&skin=0