From 0a7bce75f503fb8847030b9a62a1acce3ef359e5 Mon Sep 17 00:00:00 2001
From: Jose Medrano <josmed@microsoft.com>
Date: Wed, 16 Feb 2022 18:22:39 +0100
Subject: Creates ProxyResponderButton and makes base of FocusableBooleanButton

---
 .../Controls/Custom/FocusableBooleanButton.cs      | 23 +++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/Xamarin.PropertyEditing.Mac/Controls/Custom/FocusableBooleanButton.cs b/Xamarin.PropertyEditing.Mac/Controls/Custom/FocusableBooleanButton.cs
index f8ed20d..01ad5e0 100644
--- a/Xamarin.PropertyEditing.Mac/Controls/Custom/FocusableBooleanButton.cs
+++ b/Xamarin.PropertyEditing.Mac/Controls/Custom/FocusableBooleanButton.cs
@@ -3,7 +3,28 @@ using AppKit;
 
 namespace Xamarin.PropertyEditing.Mac
 {
-	internal class FocusableBooleanButton : NSButton
+	internal class ProxyResponderButton : NSButton
+	{
+		public ProxyRowResponder ResponderProxy { get; set; }
+
+		public override void KeyDown (NSEvent theEvent)
+		{
+			switch (theEvent.KeyCode) {
+			case (int)NSKey.Tab:
+				if (ResponderProxy != null) {
+					if (theEvent.ModifierFlags.HasFlag(NSEventModifierMask.ShiftKeyMask)) {
+						ResponderProxy.PreviousResponder ();
+					} else {
+						ResponderProxy.NextResponder ();
+					}
+				}
+				return;
+			}
+			base.KeyDown (theEvent);
+		}
+	}
+
+	internal class FocusableBooleanButton : ProxyResponderButton
 	{
 		public override bool CanBecomeKeyView { get { return Enabled; } }
 
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