Datagrid SelectedIndexChange event not firing after addin onitem command event

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C#

ASP.NET

I have a datagrid with a button column and boundcolumns And templatecolumns.When clicked on the button column firing datagrid selectedindex change event and do the functions. Its working. But when I am adding the onItemcommand event SelectedIndex is not firing

<ERP:DFDataGrid ID="dgProducts"  runat="server" AdjustFilterX="0" AdjustFilterY="0"
                                                          AutoGenerateColumns="False" CssClass="Listing"
                                                      EnableExcel="No" EnableFilter="Yes" EnablePaging="Yes" EnablePdf="No"
                                                      EnablePrint="No" EnableRowClickEvent="False" EnableWord="No"
                                                      FilterStatus="OffMode" OnApplyFilterClick=""
                                                       VisibleHeader="No"  onitemcommand="dgProducts_ItemCommand" PageSize="2"
                                                          AllowPaging="True"
                                                          DataKeyField="InvP_SeqNo"
                                                           önselectedindexchanged="dgProducts_SelectedIndexChanged"><alternatingitemstyle>
                                                      CssClass="GridAlterItem" />
                                          <columns>
                                              <asp:BoundColumn DataField="InvP_SeqNo" HeaderText="SeqNo">
                                              <asp:ButtonColumn  HeaderText="Select Product"
                                                  Text="Select Product">
                                                  <asp:BoundColumn DataField="InvP_ProdID" HeaderText="ProdID"
                                                  Visible="False">
                                              <asp:BoundColumn DataField="InvP_ID" HeaderText="InvpId" Visible="False">

                                              <asp:BoundColumn DataField="InvP_UnitId" HeaderText="UnitId" Visible="False">

                                              <asp:BoundColumn DataField="Invp_LineNo" HeaderText="Line No">
                                              <asp:BoundColumn DataField="InvP_ProdAlias" HeaderText="Alias">

                                              <asp:BoundColumn DataField="InvP_ProdName" HeaderText="Product Name">

                                              <asp:BoundColumn DataField="UOM_Name" HeaderText="Unit">
                                              <asp:BoundColumn DataField="BalanceQty" HeaderText="Balance Quantity">

                                              <asp:BoundColumn DataField="InvP_Qty" HeaderText="Quantity ">
                                              <asp:BoundColumn DataField="InvP_Rate" HeaderText="Rate">
                                              <asp:BoundColumn DataField="InvP_Amount" HeaderText="Amount">
                                              <asp:BoundColumn DataField="InvP_GrossWeight" HeaderText="Gross Weight">

                                              <asp:BoundColumn DataField="InvP_NetWeight" HeaderText="Net Weight">

                                              <asp:BoundColumn DataField="InvP_ProdDesc" HeaderText="Description "
                                                  Visible="False">
                                              <asp:BoundColumn DataField="InvP_ProdDesc1" HeaderText="Description 1"
                                                  Visible="False">
                                              <asp:BoundColumn DataField="InvP_ProdDesc2" HeaderText="Description 2"
                                                  Visible="False">
                                              <asp:BoundColumn DataField="InvP_HSCode" HeaderText="HSCode">
                                                <asp:TemplateColumn>
                          <itemtemplate>
                          <ERP:Button ID="btnView0"  runat="server" ButtonType="Icon_View" CausesValidation="false"
                                                          CommandArgument='<%#DataBinder.Eval(Container.DataItem,"Invp_SeqNo")%>'
                                                          CommandName="Viewing" KeyValues="Find" Text="" ToolTip="View" /><ERP:Button
                                                          ID="btnEdit0"  runat="server" ButtonType="Icon_Edit" CausesValidation="false"
                                                          CommandArgument='<%#DataBinder.Eval(Container.DataItem,"Invp_SeqNo")%>'
                                                          CommandName="editing" KeyValues="Save" Text="" ToolTip="Edit" /><%--<ERP:Button
                                                          ID="btnDisable0"  runat="server" ButtonType="Icon_Delete"
                                                          CausesValidation="false"
                                                          CommandArgument='<%#DataBinder.Eval(Container.DataItem,"Invp_SeqNo")%>'
                                                          CommandName="deleting" ConfirmationMessage="Are you sure to delete this?"
                                                          IsConfirmationButton="True" KeyValues="Save" Text="" ToolTip="Delete" />--%>

                                                  </itemtemplate>


                                                  </columns>
                                                  <HeaderStyle CssClass="GridHeader" />
                                                  <itemstyle cssclass="GridItem" />
                                                  <SelectedItemStyle CssClass="GridSelectedItem" />
                                                  </alternatingitemstyle>