主题：现在的页面合集的标签可以改标签背景色了吗？

Dim tab As WinForm.TabControl = e.Form.Controls("TabControl2")
Dim Name As String = "部门信息"

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)

这个代码帮忙完善一下吧，当已经有了部门信息这个页面后就不允许再增加了。与这个代码整合到一起，该怎么写