group and subgroup adding/editing, services added

TimetableDesigner.Customs/ObservableObject.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TimetableDesigner.Customs
+{
+    public class ObservableObject : INotifyPropertyChanged
+    {
+        #region PRIVATE METHODS
+
+        protected void NotifyPropertyChanged(string propertyName) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+
+        #endregion
+
+
+
+        #region EVENTS
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        #endregion
+    }
+}