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copied!<p>Lou,</p> <p>I too am struggling with this problem. There is a solution, but it doesn't seem to work so well on Windows XP. The trick is to reserve space for your DataGrid by creating a placeholder row that is empty. Move your DataGrid outside of the layout grid and set the margins as shown below.</p> <pre><code><Grid SizeChanged="Grid_SizeChanged"> <Grid.RowDefinitions> <RowDefinition Height="40" /> <RowDefinition Name="DetailGridRow" Height="*" /> <RowDefinition Height="40" /> </Grid.RowDefinitions> <Button Grid.Row="0" Width="80" Content="Do Something" Margin="5" /> <Button Grid.Row="2" Width="80" Content="Do Something Else" Margin="5" /> </Grid> <DataGrid Margin="0,40,0,40" Name="dgGrid" AutoGenerateColumns="True" /> </code></pre> <p>Now place this SizeChanged handler is your code behind class.</p> <pre><code>/// <summary> /// In order to prevent the datagrid from growing vertically the size is set to an empty /// Grid row's size. /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void Grid_SizeChanged(object sender, SizeChangedEventArgs e) { Grid layoutGrid = sender as Grid; double marginWidth = (layoutGrid.Margin.Left + layoutGrid.Margin.Right); double marginHeight = (layoutGrid.Margin.Top + layoutGrid.Margin.Bottom); double minHeight = dgGrid.MinHeight; if (e.HeightChanged) dgGrid.Height = DetailGridRow.ActualHeight > minHeight ? DetailGridRow.ActualHeight - marginHeight : minHeight - marginHeight; if (e.WidthChanged) dgGrid.Width = layoutGrid.ActualWidth - marginWidth; e.Handled = false; } </code></pre> <p>As I mentioned earlier, this technique has problems on Windows XP. The problem that I run into is that the column widths are all messed up resulting in a grid that is unusable unless you find the "magic" column and double-click it's column divider, which restores all the column widths to their correct size. I'm still working out the solution to that.</p>

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