xmlns:igEditors="http://infragistics.com/Editors"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
<Style TargetType="{x:Type igEditors:XamTextEditor}" x:Key="TheDateStyle">
<Setter Property="Format" Value="dd/MMMM/yyyy" />
</Style>
<igDP:Field Name="CaseDate" Label="Case Date" Visibility="Visible" Width="*">
<igDP:Field.Settings>
<igDP:FieldSettings EditAsType="{x:Type sys:String}"
EditorType="{x:Type igEditors:XamTextEditor}"
EditorStyle="{StaticResource TheDateStyle}" />
</igDP:Field.Settings>
</igDP:Field>