Filter RadGridTemplateColumn contains RadGridList

[Mohamed]

I have a Telerik Grid contains a template column, this column holds a RadGridList and receives its data from StringCollection, this means that I have a column with multiple values.

I'm trying to filter this column using a combobox, I can filter such columns but with only single data, but how to filter a column contains multiple data represented by StringCollection?

I Usually use this way to filter columns

<telerik:GridBoundColumn DataField="ExperienceLevel" HeaderButtonType="TextButton" HeaderText="Experience Level" SortExpression="ExperienceLevel" UniqueName="ExperienceLevel">
                      <FilterTemplate>
                          <telerik:RadComboBox ID="RadComboBoxExperienceLevel" runat="server" AppendDataBoundItems="true" DataSourceID="SqlDataSourceExperienceLevel" DataTextField="englishName" DataValueField="ExperienceLevelID" DropDownWidth="150" OnClientSelectedIndexChanged="ExperienceLevelIndexChanged" SelectedValue='<%# ((GridItem)Container).OwnerTableView.GetColumn("ExperienceLevel").CurrentFilterValue %>' Width="100">
                              <Items>
                                  <telerik:RadComboBoxItem Text="All" Value="" />
                              </Items>
                          </telerik:RadComboBox>
                          <telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
                              <script type="text/javascript">

                                  function ExperienceLevelIndexChanged(sender, args) {
                                      var tableView = $find("<%# ((GridItem)Container).OwnerTableView.ClientID %>");
                                      tableView.filter("ExperienceLevel", args.get_item().get_value(), "EqualTo");
                                  }
                              </script>
                          </telerik:RadScriptBlock>
                      </FilterTemplate>
                  </telerik:GridBoundColumn>

[Daniel]

Hello Mohamed,

So you have a RadGrid with template column where you have another RadGrid which is bound to a StringCollection? And then you need to filter by this column; not with its associated value, but with the datasource of the nested control? Is this so, or I'm missing something?

Thanks,
Daniel
the Telerik team