Move drop shadow helper

app/Helper.cs

@@ -75,5 +75,35 @@ public static void StayAwake(bool enable)
 
         [DllImport("kernel32.dll")]
         static extern int SetThreadExecutionState(uint esFlags);
+
+        public static void EnableDropShadow(IntPtr hwnd)
+        {
+            var v = 2;
+            DwmSetWindowAttribute(hwnd, 2, ref v, 4);
+
+            var margins = new MARGINS
+            {
+                bottomHeight = 0,
+                leftWidth = 0,
+                rightWidth = 0,
+                topHeight = 1
+            };
+            DwmExtendFrameIntoClientArea(hwnd, ref margins);
+        }
+
+        [DllImport("dwmapi.dll")]
+        static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
+
+        [StructLayout(LayoutKind.Sequential)]
+        struct MARGINS
+        {
+            public int leftWidth;
+            public int rightWidth;
+            public int topHeight;
+            public int bottomHeight;
+        }
+
+        [DllImport("dwmapi.dll")]
+        static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);
     }
 }

app/MainWindow.xaml.cs

@@ -38,7 +38,7 @@ protected override void OnSourceInitialized(EventArgs e)
             base.OnSourceInitialized(e);
 
             var hwnd = new WindowInteropHelper(this).EnsureHandle();
-            Shadow.ApplyShadow(hwnd);
+            Helper.EnableDropShadow(hwnd);
         }
 
         protected override void OnClosing(CancelEventArgs e)

app/ParsecVDisplay.csproj

@@ -86,7 +86,6 @@
     <Compile Include="Device.cs" />
     <Compile Include="Display.cs" />
     <Compile Include="Helper.cs" />
-    <Compile Include="Shadow.cs" />
     <Compile Include="Tray.cs" />
     <Compile Include="ParsecVDD.cs" />
     <Compile Include="Updater.cs" />