Binding to a property defined by binding on another property

Question

I've got a problem which has been tormenting me for the last couple of days. I have a grid (Infragistics) to which I've applied a CellPresenterStyle which will change the contents of the cell to a ToggleButton if

1. The cell is in the currently selected row, and
2. The databound field is contained in a collection in my ViewModel

The last piece in the puzzle is to bind the IsChecked property of the ToggleButton to a specific boolean property on my ViewModel. For instance, if the Templated field is "Counterparty", I want the ToggleButton.IsChecked binding to be to "UseQueryCounterparty".

Any ideas?? Current Style is below.

        <Style TargetType="{x:Type igDP:CellValuePresenter}" x:Key="ToggleButtonStyle">
        <Style.Triggers>
            <MultiDataTrigger>
                <MultiDataTrigger.Conditions>
                    <!-- make sure the row is selected -->
                    <Condition Binding="{Binding RelativeSource={RelativeSource Self}, Path=Record.IsSelected}" Value="True" />
                    <Condition Value="True">
                        <Condition.Binding>
                            <!-- Only change the rendering if the field is one of the break fields -->
                            <MultiBinding Converter="{StaticResource IsInCollection}" >
                                <Binding RelativeSource="{RelativeSource Self}" Path="Field.Name" />
                                <Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type vw:ResolveBreakView}}" Path="DataContext.BreakFields" />
                            </MultiBinding>
                        </Condition.Binding>
                    </Condition>
                </MultiDataTrigger.Conditions>
                <MultiDataTrigger.Setters>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ToggleButton 
                                Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.SetValueForQueryCommand}" 
                                CommandParameter="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Field.Name}"
                                >
                                <ToggleButton.IsChecked>
                                    <Binding Path="???" /> <!-- This is the line that doesn't fly -->
                                </ToggleButton.IsChecked>
                                <TextBlock Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Value}"  />
                            </ToggleButton>
                        </Setter.Value>
                    </Setter>
                    <!--<Setter Property="Background" Value="Red" />-->
                </MultiDataTrigger.Setters>
            </MultiDataTrigger>
        </Style.Triggers>
    </Style>