From 5b87057e60e6828a9f5240fd6ea32ca9e2673ac7 Mon Sep 17 00:00:00 2001
From: larsbrubaker <larsbrubaker@gmail.com>
Date: Sun, 20 Apr 2014 22:09:10 -0700
Subject: [PATCH] trying to fix memory leaks.

---
 PartPreviewWindow/GcodeViewBasic.cs | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/PartPreviewWindow/GcodeViewBasic.cs b/PartPreviewWindow/GcodeViewBasic.cs
index 2e058464f..b67c1a991 100644
--- a/PartPreviewWindow/GcodeViewBasic.cs
+++ b/PartPreviewWindow/GcodeViewBasic.cs
@@ -419,7 +419,12 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
         {
             if (!hookedParentKeyDown)
             {
-                Parent.Parent.Parent.KeyDown += new KeyEventHandler(Parent_KeyDown);
+                GuiWidget parent = Parent;
+                while (parent as SystemWindow == null)
+                {
+                    parent = parent.Parent;
+                }
+                parent.KeyDown += Parent_KeyDown;
                 hookedParentKeyDown = true;
             }
             if (partToStartLoadingOnFirstDraw != null)
@@ -598,6 +603,13 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
         public override void OnClosed(EventArgs e)
         {
+            GuiWidget parent = Parent;
+            while (parent as SystemWindow == null)
+            {
+                parent = parent.Parent;
+            }
+            parent.KeyDown -= Parent_KeyDown;
+
             if (printItem != null)
             {
                 printItem.SlicingOutputMessage -= sliceItem_SlicingOutputMessage;