diff --git a/Directory.Build.props b/Directory.Build.props
index 7865bfc..024930c 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,5 +1,5 @@
 <Project>
 	<PropertyGroup>
-		<Version>0.6.3-beta.4</Version>
+		<Version>0.6.3-rc</Version>
 	</PropertyGroup>
 </Project>
\ No newline at end of file
diff --git a/ricaun.Revit.UI.Tests/Themes/RibbonThemeUtilsTests.cs b/ricaun.Revit.UI.Tests/Themes/RibbonThemeUtilsTests.cs
index 337eec5..778ad02 100644
--- a/ricaun.Revit.UI.Tests/Themes/RibbonThemeUtilsTests.cs
+++ b/ricaun.Revit.UI.Tests/Themes/RibbonThemeUtilsTests.cs
@@ -35,5 +35,20 @@ public void ThemeChangedEventArgs_Constructor()
             Assert.IsTrue(themeChangedEventArgs.IsLight);
             Assert.IsFalse(themeChangedEventArgs.IsDark);
         }
+
+        [Test]
+        public void RibbonThemeUtils_LightDark()
+        {
+            var isLight = false;
+            var isDark = false;
+
+            RibbonThemeUtils.ThemeChangedTest(
+                () => { isLight = RibbonThemeUtils.IsLight; },
+                () => { isDark = RibbonThemeUtils.IsDark; }
+            );
+
+            Assert.IsTrue(isLight);
+            Assert.IsTrue(isDark);
+        }
     }
 }
diff --git a/ricaun.Revit.UI/Utils/RibbonThemeUtils.cs b/ricaun.Revit.UI/Utils/RibbonThemeUtils.cs
index cbd80cb..c9a8ccb 100644
--- a/ricaun.Revit.UI/Utils/RibbonThemeUtils.cs
+++ b/ricaun.Revit.UI/Utils/RibbonThemeUtils.cs
@@ -35,10 +35,12 @@ internal ThemeChangedEventArgs(bool isLight)
     /// </remarks>
     public class RibbonThemeUtils
     {
+#pragma warning disable CS0067
         /// <summary>
         /// ThemeChanged
         /// </summary>
         public static event ThemeChangedEventHandler ThemeChanged;
+#pragma warning restore CS0067
         /// <summary>
         /// Theme is Light
         /// </summary>
@@ -61,13 +63,15 @@ internal static void Dispose()
             ThemeChanged = null;
         }
 
-        internal static void ThemeChangedTest()
+        internal static void ThemeChangedTest(Action actionLight = null, Action actionDark = null)
         {
             UIFramework.RevitRibbonControl.RibbonControl.Dispatcher.Invoke(() =>
             {
                 var color = UIFramework.ApplicationTheme.CurrentTheme.ActiveTabBackgroundColor;
                 UIFramework.ApplicationTheme.CurrentTheme.ActiveTabBackgroundColor = System.Windows.Media.Colors.White;
+                actionLight?.Invoke();
                 UIFramework.ApplicationTheme.CurrentTheme.ActiveTabBackgroundColor = System.Windows.Media.Colors.Black;
+                actionDark?.Invoke();
                 UIFramework.ApplicationTheme.CurrentTheme.ActiveTabBackgroundColor = color;
             });
         }