.net - Sorting DataGrid while animating cells causes exception -

i have created datagridcell template have applied 1 of columns so:

<datagridtextcolumn binding="{binding lastupdated}"      isreadonly="true" canuserreorder="false"      canusersort="false" canuserresize="false"     cellstyle="{staticresource datagridcellstyle1}"   /> 

and template looks this:

<controltemplate targettype="{x:type datagridcell}">    <controltemplate.resources>       <storyboard x:key="cellchangedstoryboard">           <coloranimationusingkeyframes storyboard.targetproperty="(panel.background).(solidcolorbrush.color)" storyboard.targetname="dgc_border">                 <easingcolorkeyframe keytime="0" value="lightgreen"/>                 <easingcolorkeyframe keytime="0:0:8" value="red"/>             </coloranimationusingkeyframes>       </storyboard>   </controltemplate.resources>    <border x:name="dgc_border" background="red">        <contentpresenter />          <i:interaction.triggers>                <ei:timertrigger millisecondspertick="1000" >                      <ei:controlstoryboardaction storyboard="{staticresource cellchangedstoryboard}"/>                </ei:timertrigger>          </i:interaction.triggers>      </border> </controltemplate> 

in example triggering anim using blend timertrigger, doesnt matter how trigger animation, crashes try sort datagrid (by clicking on 1 of column headers)

if remove storyboard not crash on sort.

the exception invalidoperationexception: 'dgc_border' name cannot found in name scope of 'system.windows.controls.border'.

i suspect when datagrid sorts destroys or otherwise messes cells/columns , animation running can no longer find cell animating.

why exception happening , how stop it? thanks

update: seems work ok if use <controltemplate.triggers> trigger storyboard. unfortunately no solution need play storyboard when bound property changes.

best come ditch blend triggers , use this:

<border x:name="dgc_border" background="red">                         <contentpresenter snapstodevicepixels="{templatebinding snapstodevicepixels}"                                            content="{binding lastupdated, notifyontargetupdated=true}">                             <contentpresenter.triggers>                                 <eventtrigger routedevent="binding.targetupdated">                                     <beginstoryboard storyboard="{staticresource rowchangedstoryboard}" />                                 </eventtrigger>                             </contentpresenter.triggers>                         </contentpresenter>                     </border> 

i notice after grid sorts animations removed, not correct behavior me - want animations continue left off have save day.