How do I raise an OnSelectedIndex Changed for an DropDownList in the footer of a DataGrid?

[Bengt-Erik Eliasson]

Hi!

In a DataGrid I have a 'Add New'-field in the footer. I want to hide an
control (txtNewFe_name) if the value of cmbNewFe_num is >0. How do I do
that? The OnSelectedIndex Changed does not seem to response to anything, even
though I tryed with just:

Function CheckFe_num()
Response.Write( "Hello World!")
End Function

Best regards / Bengt-Erik

MyPage.aspx
........
........
<FooterTemplate >
<asp:DropDownLi st id="cmbNewFe_nu m" DataSource="<%# PopulateNewFe_n um()
%>" DataValueField= "Id" DataTextField=" Fe_num" runat="server"
OnSelectedIndex Changed="<%# CheckFe_num() %>"/>
</FooterTemplate>
........
........
........
<FooterTemplate >
<asp:TextBox id="txtNewFe_na me" runat="server" TextMode="Multi Line" />
</FooterTemplate>
.......
.......

MyPage.aspx.vb
.....
.....
Function CheckFe_num()
If CType(FindContr ol("cmbFe_num") , DropDownList).S electedItem.Val ue > 0
Then
CType(FindContr ol("txtNewFe_na me"), TextBox).Text = ""
CType(FindContr ol("txtNewFe_na me"), TextBox).Visibl e = False
Else
CType(FindContr ol("txtNewFe_na me"), TextBox).Visibl e = True
End If
End Function
......
......