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Filtering on children object property

See original GitHub issue

Salut Gilles !

The filtering on a property of a children object doesn’t seem to work. (See the last column)

    <filterdatagrid:FilterDataGrid
                Style="{DynamicResource MaterialDesignDataGrid}"
                ItemsSource="{Binding Documents, UpdateSourceTrigger=PropertyChanged}"
                SelectedItem="{Binding SelectedDocument}"
                FontSize="12"
                Grid.Row="1"
                MinHeight="150"
                MaxHeight="250"
                FilterLanguage="French"
                AutoGenerateColumns="False"
                CanUserAddRows="False"
                CanUserDeleteRows="False"
                SelectionMode="Single"
                SelectionUnit="FullRow">
                <filterdatagrid:FilterDataGrid.Columns>
                    <filterdatagrid:DataGridTemplateColumn
                        Width="50"
                        >
                        <filterdatagrid:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate
                                >
                                <materialDesign:PackIcon
                                    Kind="{Binding DocumentIcon}"
                                    Foreground="{Binding LifeCycleVM.CurrentLifeCycle.Background}" />
                            </DataTemplate>
                        </filterdatagrid:DataGridTemplateColumn.CellTemplate>
                    </filterdatagrid:DataGridTemplateColumn>
                    <filterdatagrid:DataGridTextColumn
                        Header="Code"
                        Binding="{Binding Code}"
                        Width="150"
                        IsReadOnly="True"
                        IsColumnFiltered="True"
                        />
                    <filterdatagrid:DataGridTextColumn
                        Header="Révision"
                        Binding="{Binding Revision}"
                        Width="125"
                        IsReadOnly="True"                        
                        />
                    <filterdatagrid:DataGridTextColumn
                        Header="Version"
                        Binding="{Binding LatestDocumentVersion.FormattedVersion}"
                        Width="80"
                        IsReadOnly="True" />

                    <filterdatagrid:DataGridTextColumn
                        Header="Description"
                        Binding="{Binding Name}"
                        Width="250"
                        IsReadOnly="True"
                        IsColumnFiltered="True" />
                    <filterdatagrid:DataGridTextColumn
                        Header="Cycle de vie"
                        Binding="{Binding LifeCycleVM.CurrentLifeCycle.Description}"
                        Width="500"
                        IsReadOnly="True"
                        IsColumnFiltered="True" />
                </filterdatagrid:FilterDataGrid.Columns>
            </filterdatagrid:FilterDataGrid>

document_datagrid