stop page refreshing on telerik grid

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grid

Telerik

ASP.NET4

this is my aspx code

<telerik:RadCodeBlock ID="RadCodeBlock1"  runat="server">
       <script type="text/javascript">
       </script>
   <telerik:RadAjaxManager ID="RadAjaxManager1"  runat="server">
       <ajaxsettings>
           <telerik:ajaxsetting ajaxcontrolid="gwList" xmlns:telerik="#unknown">
         </telerik:ajaxsetting>
         </ajaxsettings>
   <br />
       <telerik:RadGrid ID="gwList" AutoGenerateEditColumn="false" Skin="Forest"  runat="server" AutoGenerateColumns="false"
       AllowPaging="True" PagerStyle-AlwaysVisible="true" AllowSorting="true"  OnNeedDataSource="RadGrid1_NeedDataSource"
         önItemDataBound="gwList_OnItemDataBound">
       <mastertableview editmode="PopUp" commanditemdisplay="Top" datakeynames="RecID">
       <columns>
      <telerik:gridbuttoncolumn commandname="Edit" text="Edit" uniquename="Edcolumn" >
      </telerik:gridbuttoncolumn>
       <telerik:gridboundcolumn uniquename="Name" headertext="Name" allowfiltering="true" datafield="Name" >
       </telerik:gridboundcolumn>
       <telerik:gridboundcolumn uniquename="Abr" headertext="Abr" allowfiltering="true" datafield="Abr" >
       </telerik:gridboundcolumn>

       <telerik:gridbuttoncolumn commandname="Delete" text="Delete" uniquename="Delcolumn" ></telerik:gridbuttoncolumn>
       </columns>
       <editformsettings insertcaption="Add new item">
               EditFormType="Template" CaptionDataField="RecID" FormCaptionStyle-BackColor="ForestGreen" PopUpSettings-Modal="true" CaptionFormatString="BankID : {0}"  >
       <FormTemplate>
       <table id="table01" cellspacing="1" cellpadding="1" width="250" border="0">
        <tr>
            <td>
                Name:
            </td>
            <td>
             <asp:TextBox ID="TextBox10" Text='<%# Bind( "Name") %>'runat="server">
            </td>
        </tr>
        <tr>
           <td>
              Abr:
           </td>
           <td>
             <asp:TextBox ID="TextBox1" Text='<%# Bind( "Abr") %>' runat="server">
           </td>
        </tr>
        <tr>
          <td>
             Status:
          </td>
          <td>
             <telerik:radcombobox id="ComboStatus"  runat="server" >
           <items>
             <telerik:radcomboboxitem value="-1" text="Select" />
             <telerik:radcomboboxitem value="1" text="Active" />
             <telerik:radcomboboxitem value="0" text="In Active" />
           </items>
          </td>
        </tr>
        <br />
        <tr>
         <td colspan="2">
      <asp:Button Text="Submit" runat="server" CommandName="Insert" ID="Submit"  />
         </td>
   </tr>
       </table>
       </FormTemplate>
       </editformsettings>
       </mastertableview>

in this code if i click on edit button so page is refresh how to stop this page refreshing please help me