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    <p>You need to remove the MinWidth you set for all the data grid columns, you could also set the data grid columns Width="*" to fill-in all the space available the them. see the code below </p> <p>Ok, I found it, please remove the HorizontalAlignment from both m_MainGrid and m_DataGrid, moreover, remove all the ColumnDefinitions in m_MainGrid. I tried it on your solution and it worked.</p> <p><img src="https://i.stack.imgur.com/9kyZI.png" alt="Please follow the following steps"></p> <pre><code>&lt;Window x:Class="Data_Grid_Issue.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;Grid Margin="50" &gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="50"/&gt; &lt;RowDefinition Height="*"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Border x:Name="m_Border" CornerRadius="5,5,0,0" BorderBrush="Black" Margin="20,0,0,0" BorderThickness="1,1,1,0" HorizontalAlignment="Left" Background="LightBlue" Width="{Binding ElementName=m_DataGrid, Path=ActualWidth}"&gt; &lt;Label Content="Hello" HorizontalAlignment="Center"/&gt; &lt;/Border&gt; &lt;Grid x:Name="m_MainGrid" Grid.Row="1"&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="*"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;!--&lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="{Binding ElementName=col1, Path=ActualWidth}" /&gt; &lt;ColumnDefinition Width="{Binding ElementName=col2, Path=ActualWidth}" /&gt; &lt;ColumnDefinition Width="{Binding ElementName=col3, Path=ActualWidth}" /&gt; &lt;ColumnDefinition Width="{Binding ElementName=col4, Path=ActualWidth}" /&gt; &lt;/Grid.ColumnDefinitions&gt;--&gt; &lt;DataGrid ScrollViewer.ScrollChanged="m_DataGrid_ScrollChanged" Width="Auto" x:Name="m_DataGrid" ItemsSource="{Binding Path= Testing}" AutoGenerateColumns="False" Margin="0,0,0,0" EnableRowVirtualization="True" RowHeaderWidth="20" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="4" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Width="Auto" Binding="{Binding Path=a}" MinWidth="200" x:Name="col1" Header="Col1"&gt;&lt;/DataGridTextColumn&gt; &lt;DataGridTextColumn Width="Auto" Binding="{Binding Path=b}" MinWidth="200" x:Name="col2" Header="Col2"&gt;&lt;/DataGridTextColumn&gt; &lt;DataGridTextColumn Width="Auto" Binding="{Binding Path=c}" MinWidth="200" x:Name="col3" Header="Col3"&gt;&lt;/DataGridTextColumn&gt; &lt;DataGridTextColumn Width="Auto" Binding="{Binding Path=d}" MinWidth="200" x:Name="col4" Header="Col4"&gt;&lt;/DataGridTextColumn&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; &lt;/Grid&gt; &lt;/Grid&gt; &lt;/Grid&gt; </code></pre> <p></p>
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    1. POHorizontal Scroll Bar Always Appearing in WPF DataGrid
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    1. USMohammed A. Fadil
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    1. COHave you actually tried it out yourself? still not working after doing your suggested changes.. And I want to have a minimum width for my columns..
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      1. USHaris Hasan
    2. COCheck the update on my answer
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    3. COFirst of Thanks for your effort. I think you are not fully understanding the issue here. I have defined all the columns and have done all the alignments to make sure that user see DataGrid in a particular format which you must have observed in the sample application. In my solution I don't want user to see an extra blank column at the end. I want user to fully re-arrange the column order and sizes. I want a header over the grid. I have created whole XAML to make sure all these scenarios work and all these scenarios are working fine in my sample application.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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