How to force controls to work on postback of other controls inside GridView

1.

     <asp:TemplateField HeaderText="">
        <EditItemTemplate>
            <asp:RadioButtonList ID="rdVorI" runat="server" RepeatDirection="Horizontal" AutoPostBack="true"
                OnSelectedIndexChanged="rdVorI_SelectedIndexChanged">
                <asp:ListItem Value="Video" Text="Video" Selected="True"></asp:ListItem>
                <asp:ListItem Value="Image" Text="Image"></asp:ListItem>
            </asp:RadioButtonList>
        </EditItemTemplate>
    </asp:TemplateField>
   
    <asp:TemplateField HeaderText="Video">
        <ItemTemplate>
            <asp:ImageButton ID="vdoBtn" Height="60px" Width="60px" AlternateText="Video" BorderWidth="1px"
                BorderColor="Black" runat="server" title="Click Here" />
        </ItemTemplate>
        <EditItemTemplate>
            <asp:TextBox ID="txtEvCode" runat="server" Width="160px" />
        </EditItemTemplate>
    </asp:TemplateField>
   
    <asp:TemplateField HeaderText="Images">
        <ItemTemplate>
            <asp:HiddenField ID="key" runat="server" Value='<%#Eval("EventID") %>' />   
                                          
            <asp:ImageButton ID="imgBtn" class="thumbnail" AlternateText="Image" BorderWidth="1px"
                BorderColor="Black" runat="server" />
            <asp:ImageButton ID="imgBtn2" class="thumbnail" AlternateText="Image" BorderWidth="1px"
                BorderColor="Black" runat="server" />
            <asp:ImageButton ID="imgBtn3" class="thumbnail" AlternateText="Image" BorderWidth="1px"
                BorderColor="Black" runat="server" />
        </ItemTemplate>                                
        <EditItemTemplate>
            <asp:FileUpload ID="FileUpload1" runat="server" /><br />
            <asp:FileUpload ID="FileUpload2" runat="server" /><br />
            <asp:FileUpload ID="FileUpload3" runat="server" />
        </EditItemTemplate>
    </asp:TemplateField>
   
2.
   
    protected void rdVorI_SelectedIndexChanged(object sender, EventArgs e)
    {
 
        GridViewRow gr = (GridViewRow)((DataControlFieldCell)((RadioButtonList)sender).Parent).Parent;
        RadioButtonList rdl = (RadioButtonList)gr.FindControl("rdVorI");
        FileUpload vFile1 = (FileUpload)gr.FindControl("FileUpload1");
        FileUpload vFile2 = (FileUpload)gr.FindControl("FileUpload2");
        FileUpload vFile3 = (FileUpload)gr.FindControl("FileUpload3");
        TextBox vTitle = (TextBox)gr.FindControl("txtEvCode");
        if (rdl.SelectedValue == "Video")
        {
            vFile1.Enabled = false;
            vFile2.Enabled = false;
            vFile3.Enabled = false;
            vTitle.Enabled = true;
        }
        else
        {

            vTitle.Enabled = false;
            vFile1.Enabled = true;
            vFile2.Enabled = true;
            vFile3.Enabled = true;
        }

    }

Cheers!!!