How to change the "run in users context" in ms crm 2011 plugin using c#?

Hi all,<o:p></o:p>

I am
registering the plugin using CRM SDK (c#). can anyone tell me how we can update
the run in users context field in plugin registration tool using crm sdk.
sdkemessageproperty entity doesn’t have "run in users context" fields
in CRM DB. <o:p></o:p>

Appreciate
the help to achieve above using CRM SDK. Thanks in advance.<o:p></o:p>

Regards,<o:p></o:p>

Pankaj