I have the following data trigger in a style within a cell presenter style

<igDP:Field Name="myfield" Width="Auto">
              <igDP:Field.Settings>
                <igDP:FieldSettings>
                  <igDP:FieldSettings.CellValuePresenterStyle>
                    <Style TargetType="{x:Type igDP:CellValuePresenter}" >
                      <Style.Triggers>
                        <DataTrigger Binding="{Binding Path=IsMyValue}" Value="True">
                          <Setter Property="Background" Value="Red" />
                        </DataTrigger>
                      </Style.Triggers>
                    </Style>
                  </igDP:FieldSettings.CellValuePresenterStyle>
                </igDP:FieldSettings>
              </igDP:Field.Settings>
            </igDP:Field>

In my view model, I have

public Boolean IsMyValue { get { //etc } }

I attached a break point tothe getter of IsMyValue and it's never being called at any point.When i remove the data trigger and just set the background within the syle, it works fine.

Any ideas what might be breaking?

Thanks