Partially fix work with user color

FieldVisualizer/ViewModels/FieldViewerViewModels/FieldViewerViewModel.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FieldVisualizer.ViewModels.FieldViewerViewModels
+{
+    public class FieldViewerViewModel : ViewModelBase
+    {
+    }
+}

FieldVisualizer/ViewModels/ViewModelBase.cs

@@ -0,0 +1,24 @@
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace FieldVisualizer.ViewModels
+{
+    public class ViewModelBase : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        protected virtual void OnPropertyChanged<T>(T value, T prop, [CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        protected virtual void OnPropertyChanged<T>(T value, ref T prop, [CallerMemberName] string propertyName = null)
+        {
+            prop = value;
+            OnPropertyChanged(propertyName);
+        }
+
+        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
+            => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+}