使用WPF与RadGridview选中复选框的Combobox无效

Question

我正在尝试在Radgridview中使用checbox实现组合框。但是，当我检查gridview单元格内的任何复选框项时，它会更改所有gridview单元格复选框选择。

期望是当我在gridviewcell中选择任何复选框时，它应该只更改所选的gridview单元格而不是所有gridviewcell复选框

请帮我解决这个问题。

以下链接显示图片我期待的combobox with checkbox within a WPF DataGrid

<telerik:RadGridView Grid.Row="0" 
                             Name="pilotsGrid" 
                             ItemsSource="{Binding Pilots}"
                             AutoGenerateColumns="False" LoadingRowDetails="pilotsGrid_LoadingRowDetails" Loaded="pilotsGrid_Loaded"
                             Margin="5" CellEditEnded="pilotsGrid_CellEditEnded" CurrentCellChanged="pilotsGrid_CurrentCellChanged" SelectionChanged="pilotsGrid_SelectionChanged">

     <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn Header="Country" Width="100" Name="grdColumn"  >
           <telerik:GridViewDataColumn.CellTemplate>
              <DataTemplate>
                 <ComboBox TextBoxBase.TextChanged="ddlCountry_TextChanged" Name="ddlCountry" IsEditable="True" IsTextSearchEnabled="True"
              StaysOpenOnEdit="True" SelectionChanged="ddlCountry_SelectionChanged" 
              ItemsSource="{Binding DataContext.objCountryList,RelativeSource={RelativeSource AncestorType={x:Type telerik:RadGridView}}}" >
                    <ComboBox.ItemTemplate>
                       <DataTemplate >
                          <StackPanel>
                             <CheckBox Name="chkCountry" Unchecked="AllCheckbocx_CheckedAndUnchecked" Checked="AllCheckbocx_CheckedAndUnchecked" Content="{Binding Country_Name}"  
                          IsChecked="{Binding Check_Status ,Mode=TwoWay}"  CommandParameter="{Binding Country_ID}" ></CheckBox>                                
                          </StackPanel>
                       </DataTemplate>
                    </ComboBox.ItemTemplate>
                 </ComboBox>
              </DataTemplate>
           </telerik:GridViewDataColumn.CellTemplate>
        </telerik:GridViewDataColumn>
     </telerik:RadGridView.Columns>
</telerik:RadGridView>