Grid data does not display after rebind()

[Pete]

Hello,
I'm attempting to perform server side filtering on a RadGrid.  I'm trying to follow your examples on filtering as well as some blog posts found here and here.  On intial page load I load the Grid using a SQL data set. This loads fine.  I then load filters for the status column of "All, Active, and Working".  These values match exactly to what is returned in the data. When I click on the filter for the status column the server side event is called but the data is removed from the grid. 
Can you tell me what I'm doing wrong?
thanks
pete

ASPX

<rad:RadGrid id="RadGrid1" 

 OnItemCreated="RadGrid1_ItemCreated" 

 OnPreRender="RadGrid1_PreRender" 

 OnItemCommand="RadGrid1_ItemCommand"                                 

 ShowStatusBar="true" runat="server" AllowPaging="False" AllowSorting="True"

 AllowMultiRowSelection="True" AutoGenerateColumns="false"  

 ClientSettings-Resizing-ResizeGridOnColumnResize="false" 

 EnablePostBackOnRowClick="true"

 Width="100%"   Height="92%"  Skin="Windows7" AllowFilteringByColumn="true" EnableLinqExpressions="false">

        <MasterTableView PageSize="10" Width="100%" TableLayout="Fixed" EnableViewState="false">

              <Columns>                        

                    <rad:GridTemplateColumn UniqueName="CheckBoxTemplateColumn"  

                                           HeaderStyle-Width="10%" 

                                           HeaderStyle-HorizontalAlign="Center" 

                                           AllowFiltering="false">

                                               <HeaderTemplate>

                                                <asp:CheckBox id="headerChkbox" Text="Select All" OnCheckedChanged="ToggleSelectedState" AutoPostBack="True" runat="server"></asp:CheckBox>

                                               </HeaderTemplate>

                                               <ItemTemplate >

                                                   <asp:CheckBox id="CheckBox1" OnCheckedChanged="ToggleRowSelection" AutoPostBack="True" runat="server" Width="65"></asp:CheckBox>

                                               </ItemTemplate>                                            </rad:GridTemplateColumn>                                                         <rad:GridBoundColumn 

                                               DataField="DISCUSSION" 

                                               DataType="System.String" 

                                               HeaderText="Discussion"    

                                               Visible="False"                                                   

                                               UniqueName="DISCUSSION">

                                               <ItemStyle />

                                           </rad:GridBoundColumn>                        

                                           <rad:GridBoundColumn 

                                               DataField="KEY" 

                                               DataType="System.String" 

                                               HeaderText="ID"                                                 Visible="True"                                                   

                                               UniqueName="KEY"

                                                 

                                               HeaderStyle-HorizontalAlign="Center" 

                                               ItemStyle-HorizontalAlign="Center" 

                                               AllowFiltering="false">

                                               <ItemStyle />

                                           </rad:GridBoundColumn>

                                           <rad:GridBoundColumn 

                                               DataField="NAME" 

                                               DataType="System.String" 

                                               HeaderText="Name"                                                       

                                               UniqueName="NAME" 

                                               HeaderStyle-HorizontalAlign="Center" 

                                               ItemStyle-HorizontalAlign="Center" 

                                               HeaderStyle-Width="40%" 

                                               AllowFiltering="false">

                                               <ItemStyle />

                                           </rad:GridBoundColumn>

                                                                                       <rad:GridBoundColumn 

                                               DataField="STATUS" 

                                               DataType="System.String" 

                                               HeaderText="Status"                                                       

                                               UniqueName="STATUS"                                               

                                               SortExpression="STATUS"                                                

                                               ShowSortIcon="true"  

                                               HeaderStyle-HorizontalAlign="Center" 

                                               ItemStyle-HorizontalAlign="Center" 

                                               HeaderStyle-Width="10%" 

                                               AllowFiltering="true"

                                               AutoPostBackOnFilter="true" >

                                               <ItemStyle />

                                               <FilterTemplate>                                                    

                                                   <rad:RadComboBox ID="RadComboBoxStatus"  OnSelectedIndexChanged="FilterCombo_SelectedIndexChanged" 

                                                       DataTextField="STATUS" 

                                                       AutoPostBack="true"

                                                       DataValueField="STATUS" Width="70px"                                                          

                                                       runat="server" 

                                                       AppendDataBoundItems="true">                                                         <Items>                                                             <rad:RadComboBoxItem Text="All"  Value="All" /> 

                                                           <rad:RadComboBoxItem Text="Active"  Value="Active"/> 


                                                           <rad:RadComboBoxItem Text="Working" Value="Working" />  

                                                                                 

                                                       </Items>

                                                   </rad:RadComboBox>                                                   

                                               </FilterTemplate>

                                           </rad:GridBoundColumn>

                                                                                                                                                                          </Columns>

                                   </MasterTableView>

                                   <ClientSettings EnableRowHoverStyle="true" 

                                                   Resizing-AllowColumnResize="true"

                                                   Resizing-AllowRowResize="true"  

                                                   Resizing-EnableRealTimeResize ="false" 

                                                   Resizing-ResizeGridOnColumnResize="false" 

                                                   Resizing-ClipCellContentOnResize ="false">                                                    

                                       <Scrolling AllowScroll ="true" UseStaticHeaders="true" />

                                       <ClientEvents OnColumnResized="OnColumnResized" />                                        

                                   </ClientSettings>

                                   <PagerStyle Mode="Slider"></PagerStyle>

                               </rad:RadGrid>

CS

protected void FilterCombo_SelectedIndexChanged(object o, RadComboBoxSelectedIndexChangedEventArgs e)
    {
        string filterExpression;
        filterExpression = "([STATUS] = \'" + e.Text + "\')";
        RadGrid1.MasterTableView.FilterExpression = filterExpression;
        RadGrid1.MasterTableView.Rebind();
    }

[Cori]

Hello Pete,

If you don't handle the OnNeedDataSource event, you can't call Rebind because it doesn't know what it's rebinding to. So you need to handle that event and pass it the DataSet you're using.

I hope that helps.

[Pete]

Hello Cori,
I added the OnNeedDataSource event and at first it didn't work (wasn't calling the radcombo box selection change).  I remembered the view state and set that to true (EnableViewState=true).
Seems to be working now.
Thanks!
Pete