DataGridTemplateColumn column = new DataGridTemplateColumn();

FrameworkElementFactory factoryViewer = null;
Binding b = null;
factoryViewer = new FrameworkElementFactory(typeof(RichTextBoxExtended));
b = new Binding() { Converter = new AlarmTreeAttributeConverter(), ConverterParameter = par, Mode = BindingMode.OneWay };
factoryViewer.SetValue(RichTextBoxExtended.DataContextProperty, b);

DataTemplate cellTemplate = new DataTemplate();
cellTemplate.VisualTree = factoryViewer;
column.CellTemplate = cellTemplate;