Fix for new API, apparently the Value of the TreeView is its selection

Author: tznind

src/Design.cs

@@ -314,9 +314,9 @@ public IEnumerable<IOperation> GetExtraOperations(Mouse? mouse = null)
             }
 
             // if no column was right clicked then provide commands for the selected column
-            if (col == null && tv.Cursor.Position.Value.X >= 0)
+            if (col == null && tv.Value != null && tv.Value.Cursor.X >= 0)
             {
-                col = dt.Columns[tv.Cursor.Position.Value.X];
+                col = dt.Columns[tv.Value.Cursor.X];
             }
 
             yield return new AddColumnOperation(App, this, null);

src/UI/Windows/KeyBindingsUI.cs

@@ -17,7 +17,7 @@
 
 namespace TerminalGuiDesigner.UI.Windows {
     using Terminal.Gui;
-    
+    using Terminal.Gui.Input;
 
     public partial class KeyBindingsUI {
         private readonly IApplication app;
@@ -60,12 +60,15 @@ public KeyBindingsUI(IApplication app, KeyMap keyMap) {
                 return null;
             };
 
-            tableView.Activated += (s, e) =>
+            tableView.KeyBindings.Clear(Command.Accept);
+            tableView.KeyBindings.Add(Key.Enter, new KeyBinding([Command.Activate]));
+            tableView.Activating += (s, e) =>
             {
-                var prop = _props[tableView.Cursor.Position.Value.Y];
+                var prop = _props[tableView.Value.Cursor.Y];
                 var k = Modals.GetShortcut(app);
                 prop.SetValue(this.keyMap,k.ToString());
                 this.SetNeedsDraw();
+                e.Handled = true;
             };
             btnReset.Accepting += (s, e) =>
             {