Added the NewControl as a content replacement for the MainWindow.

PcgsInvUi/ViewModels/EditViewModel.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Reactive;
+using PcgsInvUi.Models;
+using ReactiveUI;
+
+namespace PcgsInvUi.ViewModels;
+
+public class EditViewModel : ViewModelBase
+{
+    public Coin CurrentCoin { get; set; }
+    
+    public ReactiveCommand<Unit, Unit> OkCommand { get; }
+
+    public EditViewModel(Coin coin)
+    {
+        CurrentCoin = coin;
+
+        var okEnabled = this.WhenAnyValue(
+            x => x.CurrentCoin.PcgsNumber,
+            x => x.CurrentCoin.Grade,
+            x => x.CurrentCoin.Quantity,
+            (id, grade, quantity) => (id != 0) &&
+                                     !string.IsNullOrWhiteSpace(grade) &&
+                                     (quantity != 0)
+        );
+        
+        // Setup OkCommand - all Coin-related properties must be non-whitespace.
+        OkCommand = ReactiveCommand.Create(() => { });
+    }
+}

PcgsInvUi/ViewModels/MainWindowViewModel.cs

@@ -9,23 +9,29 @@ namespace PcgsInvUi.ViewModels;
 public class MainWindowViewModel : ViewModelBase
 {
     public CoinListViewModel List { get; }
-    private ViewModelBase _content;
+    private ViewModelBase _mainContent;
+    private ViewModelBase _sideContent;
     
     public MainWindowViewModel(CoinCollection coins)
     {
         List = new CoinListViewModel(coins.GetItems());
-        Content = List;
+        MainContent = List;
     }
     
-    public ViewModelBase Content
+    public ViewModelBase MainContent
     {
-        get => _content;
-        private set => this.RaiseAndSetIfChanged(ref _content, value);
+        get => _mainContent;
+        private set => this.RaiseAndSetIfChanged(ref _mainContent, value);
+    }
+
+    public ViewModelBase SidebarContent
+    {
+        get => _sideContent;
+        private set => this.RaiseAndSetIfChanged(ref _sideContent, value);
     }
 
     public void AddItem()
     {
-        Console.WriteLine("You hit the button!");
         var newViewModel = new NewViewModel();
 
         Observable.Merge(
@@ -37,9 +43,24 @@ public class MainWindowViewModel : ViewModelBase
                 if (model != null)
                     List.CoinCollection.Add(model);
 
-                Content = List;
+                MainContent = List;
             });
         
-        Content = newViewModel;
+        MainContent = newViewModel;
+    }
+
+    public void EditItem()
+    {
+        var editViewModel = new EditViewModel(List.SelectedCoin);
+    }
+
+    public void DeleteItem()
+    {
+        
+    }
+
+    public void FindItem()
+    {
+        
     }
 }

PcgsInvUi/ViewModels/NewViewModel.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Reactive;
+using System.Collections.Generic;
 using PcgsInvUi.Models;
 using ReactiveUI;
 
@@ -26,17 +27,62 @@ public class NewViewModel : ViewModelBase
         get => _quantity;
         set => this.RaiseAndSetIfChanged(ref _quantity, value);
     }
-    
+    public List<string> GradesList { get; }
+
     public NewViewModel()
     {
         var okEnabled = this.WhenAnyValue(
             x => x.PcgsNumber,
-            x => !string.IsNullOrWhiteSpace(x));
+            x => x.Grade,
+            x => x.Quantity,
+            (id, grade, quantity) => !string.IsNullOrWhiteSpace(id) &&
+                                     !string.IsNullOrWhiteSpace(grade) &&
+                                     !string.IsNullOrWhiteSpace(quantity));
 
+        // This will eventually send our request to the public API, then construct our coin.
         OkCommand = ReactiveCommand.Create(
-            () => new Coin { PcgsNumber = Int32.Parse(PcgsNumber) },
+            () => new Coin { PcgsNumber = Int32.Parse(PcgsNumber),
+                Grade = Grade,
+                Quantity = Int32.Parse(Quantity) },
             okEnabled);
+        
         CancelCommand = ReactiveCommand.Create(() => { });
+
+        // Initialize grade values for use in the view.
+        // This must be typed out manually, as there is no way to get a list of grades from the API.
+        GradesList = new List<string>()
+        {
+            "P-01",
+            "FR-02",
+            "AG-03",
+            "G-04",
+            "G-06",
+            "VG-08",
+            "VG-10",
+            "F-12",
+            "F-15",
+            "VF-20",
+            "VF-25",
+            "VF-30",
+            "VF-35",
+            "EF-40",
+            "EF-45",
+            "AU-50",
+            "AU-53",
+            "AU-55",
+            "AU-58",
+            "MS-60",
+            "MS-61",
+            "MS-62",
+            "MS-63",
+            "MS-64",
+            "MS-65",
+            "MS-66",
+            "MS-67",
+            "MS-68",
+            "MS-69",
+            "MS-70"
+        };
     }
 
     public ReactiveCommand<Unit, Coin> OkCommand { get; }