Hallo Alex

Thank you very much for your hint.  Sorry that I did not answer earlier. I meanwhile found a solutions based on your sample. For other users with similar problems I enclose a short description  below.

Best Regards

Markus

I have several controls based on the same user control. The base user control contains a xamDataGrid. Depending on the type of the derived control there is different data (different structure) displayed in the grid.I want to change the background color for some rows. The color coding depends on the type of the derived control.

For each deived control, I have to provide the following:

1. a converter that converts a value into a color
2. a style in the data grid of the base class, that assigns a brush using the converter
3. an event handler in the base class for the FieldLayoutInitializing event. This event hander determines the derived class and assigns the appropriate style to the DataRecordPresenterStyle property.

The solution is not very elegant, but at least it works. The problem is, that the base user control has to be modified, when we need to change the background color of a new derived class.

Below you find the fragments of the relevant code

Converter:

   class MyValueToColorConverter1 :IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
                return Binding.DoNothing;

            if (value is Int32)
            {
                Int32 Grade = (Int32)value;

                switch (Grade)
                {
                    case 3:
                        return Colors.Khaki;
                    case 5:
                        return Colors.GreenYellow;
                    case 11:
                        return Colors.Orange;
                    default:
                        return Binding.DoNothing;
                }
            }
            else
            {
                return Binding.DoNothing;
            }
        }
 
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return Binding.DoNothing;
        }
    }

Styles for each derived control

<igDP:XamDataGrid.Resources>

                <Style TargetType="{x:Type igDP:DataRecordPresenter}" x:Key="BkgStyle1" >
                    <Setter Property="Background" >
                        <Setter.Value>
                            <SolidColorBrush Color="{Binding Path=DataItem.Grade, Converter={StaticResource MyValueToColorConverter1 }}"  Opacity="0.5" />
                        </Setter.Value>
                    </Setter>
                </Style>

                <Style TargetType="{x:Type igDP:DataRecordPresenter}" x:Key="BkgStyle2" >
                    <Setter Property="Background" >
                        <Setter.Value>
                            <SolidColorBrush Color="{Binding Path=DataItem.State, Converter={StaticResource MyValueToColorConverter2}}"  Opacity="0.5" />
                        </Setter.Value>
                    </Setter>
                </Style>

LayoutInitializing-Event Handler

private void xamMainDataGrid_FieldLayoutInitializing(object sender, Infragistics.Windows.DataPresenter.Events.FieldLayoutInitializingEventArgs e)
{          
    int LayoutIndex = xamMainDataGrid.FieldLayouts.IndexOf(e.FieldLayout);
    if (LayoutIndex == 0)
    {
        //
        // We assign styles for content control grid rows (Background color Coding)
        if (this is DerivedControl1)
        {
            Style BkgStyle = xamMainDataGrid.FindResource("BkgStyle1") as Style;
            e.FieldLayout.Settings.DataRecordPresenterStyle = BkgStyle;                   
        }
        else if (this is DerivedControl1)
        {
            Style BkgStyle = xamMainDataGrid.FindResource("BkgStyle2") as Style;
            e.FieldLayout.Settings.DataRecordPresenterStyle = BkgStyle;                   
        }
    }

}