From d1056cecccb80a9162a91ed070e208c6efb41619 Mon Sep 17 00:00:00 2001
From: Lars Brubaker <larsbrubaker@gmail.com>
Date: Tue, 20 Jan 2015 18:02:45 -0800
Subject: [PATCH] Make sure we release the keydown handle

---
 PartPreviewWindow/ViewGcodeBasic.cs | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/PartPreviewWindow/ViewGcodeBasic.cs b/PartPreviewWindow/ViewGcodeBasic.cs
index d9a138405..7646ecfb0 100644
--- a/PartPreviewWindow/ViewGcodeBasic.cs
+++ b/PartPreviewWindow/ViewGcodeBasic.cs
@@ -773,11 +773,20 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
                 {
                     parent = parent.Parent;
                 }
+				UnHookWidgetThatHasKeyDownHooked();
                 parent.KeyDown += Parent_KeyDown;
                 widgetThatHasKeyDownHooked = parent;
             }
         }
 
+		void UnHookWidgetThatHasKeyDownHooked()
+		{
+			if (widgetThatHasKeyDownHooked != null)
+			{
+				widgetThatHasKeyDownHooked.KeyDown -= Parent_KeyDown;
+			}
+		}
+
         void Parent_KeyDown(object sender, KeyEventArgs keyEvent)
         {
             if (keyEvent.KeyCode == Keys.Up)
@@ -982,10 +991,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
         public override void OnClosed(EventArgs e)
         {
-            if (widgetThatHasKeyDownHooked != null)
-            {
-                widgetThatHasKeyDownHooked.KeyDown -= Parent_KeyDown;
-            }
+			UnHookWidgetThatHasKeyDownHooked();
 
             if (unregisterEvents != null)
             {