Issue in click event in button present in child grid

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C#

WPF

Hello Everyone,
I am working on nested Datagrid(Parent-child) grid in wpf. I am successful in binding the children to a row by using

<DataGrid.RowDetailsTemplate>

<DataGrid.RowDetailsTemplate>

But my problem is that I want to expand my child Grid also so that that every child row consists of another grid means the flow will be like this

Each Parent Row---> Contains Child Grid

EachChildRow------> Contains Sub child grid

Parent----Child-----Subchild

I am successful in working Parent--Child but my problem is that I am unable to attatctch a sub child grid to my child grid.... Comming excatly I am unable to attach a click event to that button... I attatch the click event to the expand button... The app is not running See the code for the expand button in Child grid


//Button Present in Parent Grid For Expanding Child... Working Correctly

<DataGrid>

<DataGridTemplateColumn Header="C" >
                             <DataGridTemplateColumn.CellTemplate>
                                 <DataTemplate>
                                     <StackPanel Name="stk">
   <Button x:Name="btnCollapse" {Binding KitGroupingID}" Clickquot;btnCollapse_Click"    >
                                             <Image Source="../images/Plus.png" ></Image>
                                         </Button>
                                     </StackPanel>
                                 </DataTemplate>
                             </DataGridTemplateColumn.CellTemplate>
                         </DataGridTemplateColumn>

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.//Exapnding Code
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.

<DataGrid.RowDetailsTemplate>
                           <DataTemplate>
                               <StackPanel Orientation="Horizontal" HorizontalAlignment="Right"   >
                                   <DataGrid>
                                       <DataGrid.Columns>

                                           <DataGridTemplateColumn Header="D" >
                                               <DataGridTemplateColumn.CellTemplate>
                                                   <DataTemplate>
                                                   <StackPanel>
 <Button x:Name="btnCollapseChildren"<big>Click="btnCollpaseChild_Click"</big> >
                                                               <Image Source="../images/Plus.png" Cursor="Hand" Height="20" Width="15" Name="imgExpandChild" ></Image>
                                                           </Button>
                                                       </StackPanel>
                                                   </DataTemplate>
                                               </DataGridTemplateColumn.CellTemplate>
                                           </DataGridTemplateColumn>

You see the above code... If I add a click event to the child Grid I am getting Issue to Please solve my problem