Control event not firing from within updatepanel

[vesOvedge]

I have a listbox that is being updated via a timer and working as expected inside an UpdatePanel.However I cannot get the selectedindexchanged event to fire. I presume this is something to do with the partial postback. Does anybody know what I can do to make this work?When I move it out of the UpdatePanel it works fine. However obviously I cannot do partial postbacks.\[code\]<asp:UpdatePanel ID="UpdatePanel" runat="server" UpdateMode="Conditional"><ContentTemplate> <asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick" Interval="500"></asp:Timer> <asp:ListBox ID="ListBox_JobPositions" OnSelectedIndexChanged="ListBox_JobPositions_SelectedIndexChanged" runat="server" Height="750px" Width="300px" DataSourceID="sqlDataSource" DataTextField="Company" DataValueField="Pid"></asp:ListBox></ContentTemplate></asp:UpdatePanel>\[/code\]UPDATE:Have now tried the below change, the timer event is still working but the selectedindexchanged event is not. I am getting lost with this.\[code\]<asp:UpdatePanel ID="UpdatePanel" runat="server" ChildrenAsTriggers="False" UpdateMode="Conditional"><ContentTemplate> <asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick" Interval="500"></asp:Timer> <asp:ListBox ID="ListBox_JobPositions" runat="server" Height="750px" Width="300px" DataSourceID="sqlDataSource" DataTextField="Company" DataValueField="Pid" OnSelectedIndexChanged="ListBox_JobPositions_SelectedIndexChanged" AutoPostBack="True"></asp:ListBox></ContentTemplate><Triggers> <asp:AsyncPostBackTrigger ControlID="Timer1" /></Triggers>\[/code\]Here is the event that does not fire when the listbox is inside the UpdatePanel but does work when it is not.\[code\]protected void ListBox_JobPositions_SelectedIndexChanged(object sender, EventArgs e) { Response.Write("test"); }\[/code\]