radgrid expand/collapse event question

[Steven]

I've got a basic radgrid like the following That starts out where some of the items are expanded and some are not
When the radbutton clicks, everything resets to expanded= false
I can easily reopen everything but I don't know how to capture when somebody collapses one of the categories before the radbutton click.
I am not seeing one here clientside api  Or is there some serverside event I can force to happen? I don't see a link to serverside api on the demo page.

thanks


<telerik:RadGrid

    ID="RadGrid1" runat="server"  ShowHeader="false"

    AutoGenerateColumns="false"   

    OnDetailTableDataBind="RadGrid1_DetailTableDataBind"

    OnNeedDataSource="RadGrid1_NeedDataSource"

    GridLines="None"

    ShowStatusBar="true"  Width="300px"

    OnPreRender="RadGrid1_PreRender">

             

 

    <MasterTableView DataKeyNames="CategoryID"  AutoGenerateColumns="true" >

        <DetailTables>

            <telerik:GridTableView Name="Filters"  AutoGenerateColumns="true">

                    <ItemTemplate>

                        <telerik:RadButton Text='<%# Eval("FilterName") %>' runat="server" CategoryID='<%# Eval("CategoryID") %>' FilterID='<%# Eval("FilterID") %>' OnClick="Im_Clicked"  />

                     

                        .....'<%# Eval("CategoryID")%>'

                    </ItemTemplate>

            </telerik:GridTableView>

        </DetailTables>

 

 

        <Columns>

            <telerik:GridBoundColumn DataField="CategoryName" />

        </Columns>

    </MasterTableView>          

             

</telerik:RadGrid>

[Steven]

nm, I found it while experimenting with something else

OnItemCommand