DropDown event doesn't trigger

[John Smith]

I have DropDownList inside DataGrid:

<asp:datagrid id="DataGrid1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:BoundColumn Visible="False" DataField="id" ReadOnly="True"
HeaderText="ID"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="O">
<ItemTemplate>
<asp:DropDownList id="cmbObdelaj" runat="server" AutoPostBack=True
OnSelectedIndexChanged="DropDown_SelectedIndexChan ged">
<asp:ListItem Value="P">PPPPP</asp:ListItem>
<asp:ListItem Value="D">DDDD</asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateColumn>
</asp:datagrid>

As you can see, DropDownList have associated OnSelectedIndexChanged event,
which never triggers. :( Why?

[John Smith]

This is sub's body:

Public Sub DropDown_SelectedIndexChanged(ByVal sender As System.Object,
ByVal e As System.EventArgs)
Convert.ToInt32("SSSS")
End Sub

[John Smith]

It works fine now. I had some strange code in PageLoad() event.