主题：[求助] 通过CreateControl动态创建的ComboBox，他的SelectedIndexChanged事件需要在哪写？

你写在窗口的TextChanged事件吧。否则，你就要绑定事件了 http://www.foxtable.com/webhelp/scr/2374.htm

如果你用的是foxtablede的ComboBox，那么它实际是C1DropDownControl

全局代码

Public Sub DropBox1_ModalButtonClick(sender As Object, e As EventArgs)
    msgbox(sender.name)
End Sub

绑定事件

dim dbx as C1.Win.C1Input.C1DropDownControl = e.Form.Controls("DropBox1").basecontrol
addhandler dbx.ModalButtonClick, addressof DropBox1_ModalButtonClick

http://helpcentral.componentone.com/nethelp/c1input/C1.Win.C1Input.4~C1.Win.C1Input.C1DropDownControl_members.html

建议你直接用windows.Forms.ComboBox吧

https://msdn.microsoft.com/zh-cn/library/system.windows.forms.combobox_members(v=vs.80).aspx