Single-click-editable bound CheckBox in Xceed DataGridControl

I've spent the past hour searching for solutions to what should be a simple problem: how to create a single-click-editable bound CheckBox in Xceed's community DataGridControl.

To be clear: I want a CheckBox column where the user may click any CheckBox, regardless of what row is selected, and have the view model's IsSelected property changing accordingly.

Here is the latest permutation I've tried:

<xcdg:DataGridControl x:Name="DictionariesDataGridControl" ItemsSource="{Binding Mode=OneWay, Source={StaticResource DictionariesViewSource}}" AutoCreateColumns="False" AutoRemoveColumnsAndDetailConfigurations="False" SelectionMode="Extended" NavigationBehavior="RowOnly">
    <xcdg:DataGridControl.View>
        <xcdg:TableView UseDefaultHeadersFooters="False" ShowRowSelectorPane="False" VerticalGridLineThickness="0">
            <xcdg:TableView.FixedHeaders>
                <DataTemplate>
                    <xcdg:ColumnManagerRow BorderThickness="0"/>
                </DataTemplate>
            </xcdg:TableView.FixedHeaders>
        </xcdg:TableView>
    </xcdg:DataGridControl.View>
    <xcdg:DataGridControl.Columns>
        <xcdg:Column FieldName="IsSelected" MinWidth="20" MaxWidth="20" CellEditorDisplayConditions="RowIsCurrent">
            <xcdg:Column.CellContentTemplate>
                <DataTemplate>
                    <CheckBox IsChecked="{Binding ., Mode=OneWay}" IsHitTestVisible="False"/>
                </DataTemplate>
            </xcdg:Column.CellContentTemplate>
            <xcdg:Column.CellEditor>
                <xcdg:CellEditor>
                    <xcdg:CellEditor.EditTemplate>
                        <DataTemplate>
                            <CheckBox IsChecked="{Binding ., Mode=TwoWay}"/>
                        </DataTemplate>
                    </xcdg:CellEditor.EditTemplate>
                </xcdg:CellEditor>
            </xcdg:Column.CellEditor>
        </xcdg:Column>
    </xcdg:DataGridControl.Columns>