Radgrid and RadNumericTextBox in UI for ASP.NET AJAX

Hello i have a problem with Radgrid and RadNumericTextBox i am using a EditFormType Template that user updates only 2 values from the selected row of gridview. inside that template i am using a RadNumericTextBox to let user insert a desired numeric value... the problem is that when i hit the Update button , NULL value is stored in database....If i use a standart asp textbox the value is stored fine. Could somebody help? <telerik:RadGrid ID="RadGrid1" runat="server" AllowAutomaticUpdates="True"

                                AllowFilteringByColumn="True" AllowPaging="True" AllowSorting="True"

                                AutoGenerateEditColumn="True"

            DataSourceID="SqlDataSource1" GridLines="None"

                                PageSize="100" ShowGroupPanel="True" Skin="Default">

                                <ClientSettings AllowDragToGroup="True">

                                    <Selecting AllowRowSelect="True" />

                                    <ClientEvents OnRowDblClick="RowDblClick" />

                                </ClientSettings>

                                <MasterTableView  autogeneratecolumns="False" datakeynames="ic"

                                    datasourceid="SqlDataSource1" EditMode="PopUp" GroupLoadMode="Client">

                                    <GroupByExpressions>

                                        <telerik:GridGroupByExpression>

                                            <SelectFields>

                                                <telerik:GridGroupByField FieldAlias="symbasi" FieldName="symbasi" />

                                            </SelectFields>

                                            <GroupByFields>

                                                <telerik:GridGroupByField FieldName="symbasi" />

                                            </GroupByFields>

                                        </telerik:GridGroupByExpression>

                                    </GroupByExpressions>

                                    <RowIndicatorColumn FilterControlAltText="Filter RowIndicator column">

                                        <HeaderStyle Width="20px" />

                                    </RowIndicatorColumn>

                                    <ExpandCollapseColumn FilterControlAltText="Filter ExpandColumn column">

                                        <HeaderStyle Width="20px" />

                                    </ExpandCollapseColumn>

                                    <Columns>

                                        <telerik:GridBoundColumn AllowFiltering="false" Visible="false" UniqueName="ic" HeaderText="ic" DataField="ic">

                                        <HeaderStyle Width="60px"></HeaderStyle>

                                        </telerik:GridBoundColumn>

                                        <telerik:GridBoundColumn  UniqueName="Symbasi" HeaderText="Σύμβαση" DataField="Symbasi">

                                        </telerik:GridBoundColumn>

                                        <telerik:GridBoundColumn UniqueName="Logar" HeaderText="Λογαριασμός" DataField="Logar">

                                        </telerik:GridBoundColumn>

                                        <telerik:GridBoundColumn UniqueName="asset_class" HeaderText="Asset Class" DataField="asset_class">

                                        </telerik:GridBoundColumn>

                                        <telerik:GridBoundColumn UniqueName="poso" HeaderText="Ποσό" DataField ="poso"  dataFormatString="{0:###,##0.00}" >

                                        </telerik:GridBoundColumn>

                                        <telerik:GridBoundColumn UniqueName="pososto" HeaderText="Ποσοστό" DataField="pososto" dataFormatString="{0:###,##0.00}"  >

                                        </telerik:GridBoundColumn>

                                        <telerik:GridBoundColumn UniqueName="Ekptosi" HeaderText="Εκπτωση" DataField="Ekptosi" dataFormatString="{0:###,##0.00}">

                                        </telerik:GridBoundColumn>      

                                        <telerik:GridBoundColumn UniqueName="Total" HeaderText="Total" DataField="Total" dataFormatString="{0:###,##0.00}">

                                        </telerik:GridBoundColumn>

                                    </Columns>

                                    <EditFormSettings   InsertCaption="Add new item" CaptionFormatString="ic: {0}"

                CaptionDataField="ic" EditFormType="Template" PopUpSettings-Modal="true">

                                        <EditColumn    FilterControlAltText="Filter EditCommandColumn column">

                                        </EditColumn>

                                        <FormTemplate>

                                            <table ID="Table1" border="0" cellpadding="1" cellspacing="1" width="250">

                                                <tr>

                                                    <td>

                                                        Ποσό: </td><td>

                                                        <asp:TextBox ID="TextBox1" Enabled="false" runat="server" Text='<%# Bind("poso","{0:0.00}") %>' > </asp:TextBox></td></tr><tr>

                                                    <td>

                                                        ΕΚΠΤΩΣΗ: </td><td>

                                                       <telerik:RadNumericTextBox

                                                         ID="TextBox10"  

                                                         DbValue='<%#  Convert.ToDouble(Eval("Ekptosi"))   %>' 

                                                         runat="server" 

                                                         ShowSpinButtons="true"  

                                                         MinValue="0"

                                                         MaxValue='<%# Convert.ToDouble(Eval("poso")) %>'>

                                                         <ClientEvents OnKeyPress="NumericTextBoxOnLoad" />

                                                       </telerik:RadNumericTextBox>

                                                    </td></tr><tr>

                                            </tr><tr>

                                 </tr></table><table style="width: 100%">

                                                <tr>

                                                    <td align="right" colspan="2">

                                                        <asp:Button ID="Button1" runat="server" CommandName="Update" Text="Update"   />

                                                          <asp:Button ID="Button2" runat="server" CausesValidation="False"

                                                            CommandName="Cancel" Text="Cancel" />

                                                    </td>

                                                </tr>

                                            </table>

                                        </FormTemplate>

                                    </EditFormSettings>

                                </MasterTableView>

                            </telerik:RadGrid>

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Radgrid and RadNumericTextBox

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