RelatedButtonEdit.xaml

<dxe:ButtonEdit x:Class="DDT.Controls.RelatedButtonEdit"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:converters="clr-namespace:DDT.Converters"
             xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
             mc:Ignorable="d" 
             d:DesignHeight="20" d:DesignWidth="150"
             DisplayTextConverter="{StaticResource RelatedButtonDisplayTextConverter}" 
             IsTextEditable="False" 
             AllowDefaultButton="False">
    <dxe:ButtonInfo GlyphKind="Edit" Click="EditButton_Click"/>
    <dxe:ButtonInfo GlyphKind="Search" Click="SearchButton_Click"/>
    <dxe:ButtonInfo GlyphKind="Cancel" Click="ClearButton_Click"/>
</dxe:ButtonEdit>