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When I select (by clicking or by keyboard) blank row on my DataGrid (when I want to add new row), unexpected validation error occurs (but with no exception) - the border of datagrid changes to red color, as you can see on the image below. When I click second time on blank row, the red border dissapears. Everything other works fine, the new row is added. Besides, I don't have any validation rules. And when I make a row with empty text, value is valid. I don't want this behavior and this red border, anybody knows, why this happens and how to fix it? Why and where some validation fails? Below I append some source code: DataGrid definition in xaml: <DataGrid IsSynchronizedWithCurrentItem="True" DisplayMemberPath="Name" ItemsSource="{Binding Path=ConfigFiles}" SelectedItem="{Binding Path=SelectedConfigFile}" Grid.Column="1" Height="87" Margin="0,26,11,32" Style="{DynamicResource DataGridStyle}"> <DataGrid.Columns> <DataGridTextColumn Width="1*" Binding="{Binding Name}" /> </DataGrid.Columns> </DataGrid> My ViewModel's part: public class ManageModulesVM : BaseVM // Implements INotifyPropertyChanged { // ... public ObservableCollection<ConfigFile> ConfigFiles { get { return selectedModule == null ? null : selectedModule.ConfigFiles; } set { selectedModule.ConfigFiles = value; OnPropertyChanged(() => ConfigFiles); } } public ConfigFile SelectedConfigFile { get { return selectedModule == null ? null : selectedModule.SelectedConfigFile; } set { if (value != null) { selectedModule.SelectedConfigFile = value; } OnPropertyChanged(() => SelectedConfigFile);

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