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I asked a question at http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/5c7f5cdf-4351-4969-990f-29ce9ec84b87/ , but still lack a good explanation for a strange behavior. Running the following XAML shows that the TextBlock in column 0 is width greater than 100 even though the column is set to width 100. I think that the strangeness may have something to do with it being wrapped in a ScrollViewer, but I don't know why. If I set a MaxWidth on the columns, it works fine, but setting Width does not. Why is the width of column 0 not being honored? Why does the column sizing behave differently when you remove the scroll viewer? I appreciate any explanation! This is a real puzzle to me. <Window x:Class="WpfApplication2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Width="300"> <ScrollViewer HorizontalScrollBarVisibility="Auto" > <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="100" /> <ColumnDefinition Width="100" /> <ColumnDefinition /> </Grid.ColumnDefinitions> <TextBlock x:Name="textBlock" Text="{Binding ElementName=textBlock, Path=ActualWidth}" /> <TextBlock Text="column 1" Grid.Column="1" /> <TextBlock Grid.Row="1" Grid.ColumnSpan="3" Text="text here that is wider than the first two columns combined" /> </Grid> </ScrollViewer> </Window>

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