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If you run the sample window below the upper ItemsControl will update layout for several seconds until finally all columns will have the correct width (correct = identical to the columns inside the lower ItemsControl). You can change the width of the window and scroll the lower ItemsControls surrounding ScrollViewer both horizontally and vertically -- but as soon as you change the height of the Window the layout will flip for several seconds. Note: There is no sizing ambiguity like in other questions where the grid infinitely updates sizes. Is it me doing something wrong -- and if so, how could I fix this? -- or should I post this problem to Microsoft-Connect? Code behind: namespace DynamicGridColumnBinding { using System; using System.Collections.Generic; using System.Globalization; using System.Linq; using System.Windows; using System.Windows.Controls; public partial class MainWindow { private static readonly CultureInfo[] cultureInfos = CultureInfo.GetCultures(CultureTypes.NeutralCultures).Take(15).ToArray(); public MainWindow() { this.InitializeComponent(); } public static IEnumerable<CultureInfo> AllCultures { get { return cultureInfos; } } private void GridInitialized(object sender, EventArgs e) { var grid = (Grid)sender; for ( int i = 0; i < cultureInfos.Length; i++ ) grid.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto, SharedSizeGroup = "g" + i, }); } private void ScrollViewerScrollChanged(object sender, ScrollChangedEventArgs e) { if ( e.HorizontalChange != 0 ) this.legendScroller.ScrollToHorizontalOffset(e.HorizontalOffset); } } }

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