WPF

<DataGrid x:Name="FamilyEditorGrid" ItemsSource="{Binding Path=AllBlogs}" MaxHeight="575"
                        Background="{x:Null}"                                         
                        Margin="0,0,0,0"
                        BorderBrush="{x:Null}"
                        AutoGenerateColumns="False"
                        SelectionMode="Single"
                        GridLinesVisibility="None"  
                        RowDetailsTemplate="{StaticResource RowDetailItemTemplate}"
                        RowDetailsVisibilityMode="{Binding Path=BlogIsSelected, Converter={StaticResource boolToVisibilityConverter}}"
                        >
                        <DataGrid.CellStyle>
                            <Style TargetType="{x:Type DataGridCell}">
                                <Setter Property="VerticalContentAlignment" Value="Center" />
                            </Style>
                           
                        </DataGrid.CellStyle>

                        <!--<DataGrid.RowStyle>
                            <Style TargetType="{x:Type DataGridRow}">
                                <Setter Property="Height" Value="32" />
                            </Style>
                        </DataGrid.RowStyle>-->
                        <DataGrid.Columns>
                            <DataGridCheckBoxColumn Header=""                                                           
                                Binding="{Binding Path=BlogIsSelected}"
                                SortMemberPath="BlogIsSelected" Width="35" 
                                />
                            <DataGridTextColumn Header="Blog URL"                                                           
                                Binding="{Binding BlogURL}"
                                SortMemberPath="BlogURL"
                                IsReadOnly="True" Width="auto" />
</DataGrid.Columns>
                        
                    </DataGrid>

Pete wrote:

The issue is that resources that are in or consumed in a control template have to be frozen. This is done so that the resource can be shared across control instances quickly. Once you set the binding on the Dependency Object on a Freezable, you stop it from being frozen.

As you can't create a static resource of the RepeatBehavior, I'd suggest that this is one of those instances where it is perfectly legitimate to have code in the code behind of the view. Don't tie yourself into logical knots here - view specific code in the view code-behind is legitimate.

Moonwalker031 wrote:

It has binding to an observable collection of strings.