Hi, if the method proposed by Miguel doesn't work in your case, you could use GetElementByIDMessage or GetElementByNameMessage in your ad-hoc data source to retrieve the information.

var elementInfo = dms.SendMessage(new GetElementByIDMessage(agentID, elementID)) as ElementInfoEventMessage;
var isActive = elementInfo.State == ElementState.Active;

The dms object can be retrieved in the OnInit() method:

public OnInitOutputArgs OnInit(OnInitInputArgs args)
{
dms = args.DMS;
return new OnInitOutputArgs();
}