diff --git a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/DocumentPaneTabPanel.cs b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/DocumentPaneTabPanel.cs
index 1bacd43e..6d0d3351 100644
--- a/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/DocumentPaneTabPanel.cs
+++ b/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.AvalonDock/Controls/DocumentPaneTabPanel.cs
@@ -37,8 +37,6 @@ namespace Xceed.Wpf.AvalonDock.Controls
 
     protected override Size MeasureOverride( Size availableSize )
     {
-      var visibleChildren = Children.Cast<UIElement>().Where( ch => ch.Visibility != System.Windows.Visibility.Collapsed );
-
       Size desideredSize = new Size();
       foreach( FrameworkElement child in Children )
       {