WPF DataGrid - Why is there a empty column?

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Can someone explain why there is this empty column (before Column1) in my data grid?

Here is the XAML

<DataGrid x:Name="mydatagrid" ItemsSource="{Binding}" AutoGenerateColumns="true" Margin="0,20,-3,-2" IsReadOnly="True" AutoGeneratingColumn="OnAutoGeneratingColumn"/>

The object class it is bound to is a subclass of INotifyPropertyChanged, and I am fairly certain that none of my properties of my class are causing that column to be there, because if they were, wouldn't the column have the name of that property?

Is there a better way to remove/hide this column without having to resort to negative left margins for the datagrid?

asked 19 secs ago

matt burnett

126