Developer Dashboard using Powershell

on

$sp2010 = [Microsoft.SharePoint.Administration.SPWebService]::ContentService.DeveloperDashboardSettings;
$sp2010.DisplayLevel = [Microsoft.SharePoint.Administration.SPDeveloperDashboardLevel]::OnDemand;
$sp2010.RequiredPermissions = 'EmptyMask';
$sp2010.TraceEnabled = $true;
$sp2010.Update();

off

$sp2010 = [Microsoft.SharePoint.Administration.SPWebService]::ContentService.DeveloperDashboardSettings;
$sp2010.DisplayLevel = [Microsoft.SharePoint.Administration.SPDeveloperDashboardLevel]::Off;
$sp2010.Update();