From cf9b17f19dd652e806ea0d7c35918238ddf86871 Mon Sep 17 00:00:00 2001
From: xsnakes <xsnakes@ya.ru>
Date: Mon, 7 Sep 2020 16:29:46 +0300
Subject: [PATCH] Update TransitioningContentControl.cs

Fix. Null Exception.
When using "ContextMenu" with "TransitioningContentControl" and when "MenuItem" call "Application Shutdown", then the application throws a null exception, because "Application.Current" is null and fadeout animation call "ResourceHelper.GetResource".
---
 .../Controls/Other/TransitioningContentControl.cs     | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/Shared/HandyControl_Shared/Controls/Other/TransitioningContentControl.cs b/src/Shared/HandyControl_Shared/Controls/Other/TransitioningContentControl.cs
index 07f7dea9..2199bf41 100644
--- a/src/Shared/HandyControl_Shared/Controls/Other/TransitioningContentControl.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Other/TransitioningContentControl.cs
@@ -49,7 +49,14 @@ namespace HandyControl.Controls
         {
             if (Visibility != Visibility.Visible || _contentPresenter == null) return;
 
-            (TransitionStoryboard ?? ResourceHelper.GetResource<Storyboard>($"{TransitionMode.ToString()}Transition"))?.Begin(_contentPresenter);
+            if (TransitionStoryboard != null)
+            {
+                TransitionStoryboard.Begin(_contentPresenter);
+            }
+            else if (Application.Current != null)
+            {
+                ResourceHelper.GetResource<Storyboard>($"{TransitionMode.ToString()}Transition")?.Begin(_contentPresenter);
+            }
         }
 
         public override void OnApplyTemplate()
@@ -73,4 +80,4 @@ namespace HandyControl.Controls
             }
         }
     }
-}
\ No newline at end of file
+}