__EVENTARGUMENT is reposted upon next postback

[tozoborai]

I have some javascript that handles a postback from a listbox like this:\[code\]__doPostBack('<%= upCompanieslist.ClientID %>', 'UpdateLV');\[/code\]I also have an updatepanel with an AsyncPostBackTrigger tied to its itemcommand event.\[code\] <Triggers> <asp:AsyncPostBackTrigger ControlID="lvCompanyList" EventName="ItemCommand" /> </Triggers>\[/code\]Once the __doPostBack is fired its set to "UpdateLV". The problem is that it remains "UpdateLV" when the next time the updatepanel is fired. Is there a way to clear the __EventArgument after a post back of any type?