disable gridview checkbox on page load

I want to disable gridview checkboxes on page_load. I tried the link from here but it was not according to my requirement. kindly suggest what to do

<cc1:Grid ID="GrdWorkingCompany" runat="server" EnableTypeValidation="true" CallbackMode="true"
                                ShowFooter="false" AutoGenerateColumns="false" AllowAddingRecords="true" AllowSorting="false"
                                Width="100%" FolderStyle="~/Styles/Grid/style_12" PageSize="18">
                                <Columns>
                                    <cc1:Column ID="Sr_No" ReadOnly="true" DataField="SrNo" HeaderText="Sr.No." Width="50px">
                                    </cc1:Column>
                                    <cc1:Column ID="Points" ReadOnly="true" DataField="Points" HeaderText="Points" runat="server" Width="300px">
                                    </cc1:Column>
                                    <cc1:Column ID="chkPoor" ReadOnly="true" DataField="Rating1" HeaderText="Poor" Width="110px" TemplateId="tpltPoor">
                                    </cc1:Column> 
                                    <cc1:Column ID="chkSatisfactory" DataField="Rating2" HeaderText="Satisfactory" ReadOnly="true"
                                        Width="110px" TemplateId="tpltSatisfactory">
                                    </cc1:Column>
                                    <cc1:Column ID="chkGood" ReadOnly="true" HeaderText="Good" DataField="Rating3" Width="110px" TemplateId="tpltGood">
                                    </cc1:Column>
                                    <cc1:Column ID="chkExcellent" HeaderText="Excellent" DataField="Rating4" Width="110px" ReadOnly="true"
                                        TemplateId="tpltEx1">
                                    </cc1:Column>
                                </Columns>
                                <TemplateSettings GroupHeaderTemplateId="GroupTemplate" />
                                <Templates>
                                    <cc1:GridTemplate runat="server" ID="GridTemplate2">
                                        <Template>
                                            <%# Container.Column.HeaderText %>
                                            : <i>
                                                <%# Container.Value %></i> (<%# Container.Group.PageRecordsCount %><%# Container.Group.PageRecordsCount > 1 ? "records" : "record" %>)
                                        </Template>
                                    </cc1:GridTemplate>
                                </Templates>
                                <Templates>
                                    <cc1:GridTemplate ID="tpltPoor">
                                        <Template>
                                            <input type="checkbox" id="chkA1<%# (Container.RecordIndex)%>" name="chkAC1" style="width: 17px; 
                                                height: 17px;" value="<%# (Container.RecordIndex)%>" onclick="AppoveCheckA(this)" /></Template>
                                    </cc1:GridTemplate>
                                    <cc1:GridTemplate ID="tpltSatisfactory">
                                        <Template>
                                            <input type="checkbox" id="chkA2<%# (Container.RecordIndex) %>" name="chkAC2" style="width: 17px;
                                                height: 17px;" value="<%# (Container.RecordIndex)%>" onclick="AppoveCheckA(this)" /></Template>
                                    </cc1:GridTemplate>
                                    <cc1:GridTemplate ID="tpltGood">
                                        <Template>
                                            <input type="checkbox" id="chkA3<%# (Container.RecordIndex) %>" name="chkAC3" style="width: 17px;
                                                height: 17px;" value="<%# (Container.RecordIndex)%>" onclick="AppoveCheckA(this)" /></Template>
                                    </cc1:GridTemplate>
                                    <cc1:GridTemplate ID="tpltEx1">
                                        <Template>
                                            <input type="checkbox" id="chkA4<%# (Container.RecordIndex) %>" name="chkAC4" style="width: 17px;
                                                height: 17px;" value="<%# (Container.RecordIndex)%>" onclick="AppoveCheckA(this)" /></Template>
                                    </cc1:GridTemplate>
                                </Templates>
                            </cc1:Grid>