TabView steals keypresses from active ContextMenu

[tznind]

Describe the bug
When a view has a TabView and you open a right click context menu in root view then the left/right keypresses are taken first by the tab view.

To Reproduce

• Right click to open context menu
• Navigate up and down and into and out of context menu submenu

Expected not to see tab view steal keystrokes.
You often have to press Left twice e.g. to collapse submenu

        Application.Init ();

        var win = new Window ()
        {
            Title = "My Window",
            X = 0,
            Y = 0,
            Width = Dim.Fill (),
            Height = Dim.Fill ()
        };

        // Tab View
        var tabView = new TabView ()
        {
            X = 1,
            Y = 1,
            Width = Dim.Fill () - 2,
            Height = Dim.Fill () - 2
        };
        tabView.AddTab (new Tab (){DisplayText = "Tab 1" }, true);
        tabView.AddTab (new Tab (){DisplayText = "Tab 2"}, false);
        win.Add (tabView);

        // Context Menu
        var contextMenu = new ContextMenu ();

        var menu =
            new MenuBarItem (
                             new MenuItem []
                             {
                                 new MenuItem ("Item 1", "First item", () => MessageBox.Query ("Action", "Item 1 Clicked", "OK")),
                                 new MenuBarItem (
                                                  "Submenu",
                                                  new List<MenuItem []>
                                                  {
                                                      new MenuItem []
                                                      {
                                                          new MenuItem (
                                                                        "Sub Item 1",
                                                                        "Submenu item",
                                                                        () =>
                                                                        {
                                                                            MessageBox.Query ("Action", "Sub Item 1 Clicked", "OK");
                                                                        })

                                                      }
                                                  })
                             });

        win.MouseClick += (s,e) =>
                          {
                              if (e.Flags.HasFlag (MouseFlags.Button3Clicked)) // Right-click
                              {
                                  contextMenu.Position = e.Position;
                                  contextMenu.Show (menu);
                              }
                          };

        Application.Run (win);
        Application.Shutdown ();

Expected behavior
While context menu is open the tab view should not be getting key presses.

Screenshots

[tig]

@tznind when you create these can you please set the properties?

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