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有三个 ComboBox控件自定义项目提前设置好了在e.Form.Controls("tongdaomingchengComboBox") 的SelectedIndexChanged事件中写了如下代码：

Dim cmb As WinForm.ComboBox =e.Form.Controls("tongdaomingchengComboBox")

Dim tdjc As WinForm.ComboBox =e.Form.Controls("tongdaojianchengComboBox")

Dim zxt As WinForm.ComboBox =e.Form.Controls("zixitongComboBox")

If cmb.Value IsNot Nothing Then

If cmb.Value = "海科融通" Then

tdjc.ComboList = "Hkrt"

tdjc.Value =""

tdjc.SelectedText = "Hkrt"

zxt.ComboList = "传统POS|QPOS"

zxt.Value =""

zxt.SelectedText = "传统POS"

tdjc.writevalue

zxt.writevalue

ElseIf cmb.Value = "盒子支付"

tdjc.ComboList = "Hzzf"

tdjc.Value =""

tdjc.SelectedText ="Hzzf"

zxt.ComboList = "1.0系统|2.0系统"

zxt.Value =""

zxt.SelectedText = "1.0系统"

tdjc.writevalue

zxt.writevalue

End If

为什么e.Form.Controls("tongdaomingchengComboBox") 选好项目后e.Form.Controls("tongdaojianchengComboBox")会随着变化，而e.Form.Controls("zixitongComboBox")控件不发变化，必须再选一次才变化呀

主题：关于联动三级菜单问题