RibbonGroup support for LauncherButton

src/Shared/HandyControl_Shared/Data/ValueBoxes.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Windows;
 using System.Windows.Controls;
 
@@ -23,8 +23,6 @@ internal static class ValueBoxes
 
     internal static object HiddenBox = Visibility.Hidden;
 
-    internal static object Double0Box = .0;
-
     internal static object Double01Box = .1;
 
     internal static object Double0Box = .0;