Determine if new inspector is the result of a popout

    public class ApplicationState
    {
        // State held by individual inspectors
        // 
        public Dictionary<string, MailState> MailStates { get; set; }

        // State that is held for the Explorer instance of
        // MailSecurityTopPane
        public MailState ExplorerMailState { get; set; }


        // constructor
        public ApplicationState()
        {
            MailStates = new Dictionary<string, MailState>();
        }
    }

        private void MailSecurityTopPane_Load(object sender, EventArgs e)
        {
            // Subscribe to application state updates
            // We put the subscription in an IDisposable so we can release the update pipe
            // Before we close the form

            // When we are dealing with inspectors
            if (CurrentInspector?.CurrentItem is Outlook.MailItem)
            {
                ConversationID = CurrentInspector.CurrentItem.GetHashCode().ToString();

                StoreSubscription = Store.Subscribe(state =>
                {
                    state.MailStates.TryGetValue(ConversationID, out MailState mailState);
                    UpdateValues(mailState);
                });
            }

            // When we are dealing with an explorer instance of the form
            // The Conversation ID comes from the ExplorerConversation state

            if (CurrentExplorer != null)
            {
                StoreSubscription = Store.Subscribe(state =>
                {
                    ConversationID = Constants.ExplorerConversation;
                    UpdateValues(state.ExplorerMailState);
                });
            }


        }

        private void outlookAppEvents_NewInspector(object sender, object inspector, string folderName)
        {
            var insp = inspector as Outlook.Inspector;
           
            // TODO: Determine if this new inspector is the result of a popout or not
            // so we can decide to add a new viewmodel for the MailSecurityTopPane
            // or if we need to copy the viewmodel used in the Explorer instance of MailSecurityTopPane
            if (insp.CurrentItem is Outlook.MailItem)
            {
                OutlookItemEvents.ConnectTo(insp.CurrentItem, true);
                
                Store.Dispatch(new InspectorActivatedAction() { ItemId = insp.CurrentItem.GetHashCode().ToString() });
            }

        }

        // Whenever we have an inline response
        private void outlookAppEvents_ExplorerInlineResponse(object sender, object itemObject)
        {
            if (itemObject is Outlook.MailItem)
            {
                //Get the mail item
                var item = itemObject as Outlook.MailItem;
                
                // add a userprop without saving it to keep things clean
                // the userprop is still there when we catch the MailItem in New_Inspector
                var prop = item.UserProperties.Add("InlineResponded", Outlook.OlUserPropertyType.olNumber, false);
                prop.Value = 1;


                Marshal.ReleaseComObject(item);
            }
        }

        private void outlookAppEvents_NewInspector(object sender, object inspector, string folderName)
        {
            var insp = inspector as Outlook.Inspector;
           

            if (insp.CurrentItem is Outlook.MailItem)
            {

                //try to find prop
                var item = insp.CurrentItem as Outlook.MailItem;

                if ( item.UserProperties["InlineResponded"] != null )
                {
                    // New inspector is based on a MailItem that comes
                    // from an inline response
                    
                    // remove the property as we don't need it anymore
                    item.UserProperties["InlineResponded"].Delete();
                }
                else
                {
                    // The new Inspector does not come from a popout

                }


                Marshal.ReleaseComObject(item);
            }

        }