Hi,

I think the following technique should satisfy your requirement...

<Window.Resources>
  <Style x:Key="VariableCellEditorStyle" TargetType="{x:Type igDP:CellValuePresenter}">
    <Style.Triggers>
      <DataTrigger Binding="{Binding Path=Cells[SomeField].Value}" Value="0">
        <Setter Property="Template">
          <Setter.Value>
            <ControlTemplate TargetType="{x:Type igDP:CellValuePresenter}">
              <TextBox
                Background="LightBlue"
                Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Value}"
                />
            </ControlTemplate>
          </Setter.Value>
        </Setter>
      </DataTrigger>
      <DataTrigger Binding="{Binding Path=Cells[SomeField].Value}" Value="1">
        <Setter Property="Template">
          <Setter.Value>
            <ControlTemplate TargetType="{x:Type igDP:CellValuePresenter}">
              <igEditors:XamTextEditor
                Background="Gray"
                IsReadOnly="True"
                Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Value}"
                />
            </ControlTemplate>
          </Setter.Value>
        </Setter>
      </DataTrigger>
    </Style.Triggers>
  </Style>
</Window.Resources>

<igDP:XamDataGrid x:Name="xamDG">
  <igDP:XamDataGrid.FieldLayouts>
    <igDP:FieldLayout>
      <igDP:FieldLayout.Fields>
        <igDP:Field Name="State">
          <igDP:Field.Settings>
            <igDP:FieldSettings CellValuePresenterStyle="{StaticResource VariableCellEditorStyle}" />
          </igDP:Field.Settings>
        </igDP:Field>
      </igDP:FieldLayout.Fields>
    </igDP:FieldLayout>
  </igDP:XamDataGrid.FieldLayouts>
</igDP:XamDataGrid>

Josh