Fixed #1255.

9 years ago · 70f9554518
1 changed files with 1 additions and 1 deletions
--- a/src/Avalonia.Controls/Classes.cs
+++ b/src/Avalonia.Controls/Classes.cs
@ -179,7 +179,7 @@ namespace Avalonia.Controls
            {
                ThrowIfPseudoclass(name, "removed");
-                if (!Contains(name))
+                if (Contains(name))
                {
                    c.Add(name);
                }