ready for display Modal

Apollon.WPF/Stores/ModalNavigationStore.cs

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+using Apollon.WPF.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Apollon.WPF.Stores
+{
+    public class ModalNavigationStore
+    {
+		private ViewModelBase _currentViewModel
+			;
+		public ViewModelBase CurrentViewModel	
+		{
+			get
+			{
+				return _currentViewModel;
+			}
+			set
+			{
+                _currentViewModel = value;
+				CurrentViewModelChanged?.Invoke();
+			}
+		}
+
+		public bool IsOpen => CurrentViewModel != null;
+
+		public event Action CurrentViewModelChanged;
+	}
+}