Trigger update of UpdatePanel inside user control?

Is there any way to trigger up开发者_开发百科date of updatepanel inside a web user control through use of a property ? This does not work

public bool RefreshExclusions
{
    set
    {
        upnl1.Update();
    }
}

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you can find update panel from your user control and call update method. like...

((UpdatePanel)Usercontrol.FindControl("updatePanelID")).Update();