How to find Button id in Radconfirm_Ok_click

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C#

Telerik

<asp:Button ID="btnTsave"  runat="server" Text="Save as Draft" CommandName="Save" OnClick="btnSaveasDraft_Click" />
                <asp:Button ID="btnConfirm" runat="server" Text="Confirm" CommandName="Confirm" OnClick="btnConfirm_Click" />
                <asp:Button ID="btnApprove" runat="server"  Text="Approve" CommandName="Approve" OnClick="btnApprove_Click" />
 <cc1:RadWindowManager  runat="server" ID="RadWindowManager1">
    <Windows>
        <cc1:RadWindow ID="rw_customConfirm" Modal="true" Behaviors="Close, Move" VisibleStatusbar="false"
            Width="300px" Height="200px"  runat="server">
            <ContentTemplate>
                <div class="rwDialogPopup radconfirm">
                    <div class="rwDialogText">
                        <asp:Literal ID="confirmMessage" Text="" runat="server" />
                    </div>
                    <div>
                        <cc1:RadButton  runat="server" ID="rbConfirm_OK" Text="OK"  önClick="rbConfirm_OK_Click">
                        </cc1:RadButton>
                        <cc1:RadButton  runat="server" ID="rbConfirm_Cancel" Text="Cancel"  önClientClicked="closeCustomConfirm">
                        </cc1:RadButton>
                    </div>
                </div>
            </ContentTemplate>
        </cc1:RadWindow>
    </Windows>
</cc1:RadWindowManager>

protected void btnApprove_Click(object sender, EventArgs e)
        {
             
            confirmMessage.Text = "Are you sure you want to Save this file?";
            string script = "function f(){radopen(null, 'rw_customConfirm');                                    Sys.Application.remove_load(f);}Sys.Application.add_load(f);";
           ScriptManager.RegisterStartupScript(Page, Page.GetType(), "customConfirmOpener", script, true);
        }
protected void btnSaveasDraft_Click(object sender, EventArgs e)
        {
 confirmMessage.Text = "Are you sure you want to Save this file in Draft?";
            string script = "function f(){radopen(null, 'rw_customConfirm');                                    Sys.Application.remove_load(f);}Sys.Application.add_load(f);";
           ScriptManager.RegisterStartupScript(Page, Page.GetType(), "customConfirmOpener", script, true);
}

now what will happen after clicking on one button based on button click radconfirm will open now after clicking on "ok" button in RadConfirm it will perform 3operations means if button1 ok click it will some and if it button2 click it will do some other like that

protected void rbConfirm_OK_Click(object sender, EventArgs e)
        {
            
//here i have two perform 3operations if it save button ok clik it will do some
//if it is Approve button ok click it will do some other
            }
        }

how to find button id in RadConfirm ok click