ButtonInfo Class

public class ButtonInfo : ButtonInfoBase, ICommandSource

Public Class ButtonInfo Inherits ButtonInfoBase, ICommandSource

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using DevExpress.Xpf.Editors;

namespace DXEditors_HowToCreateButtonEdit {
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
            CreateEditButton(btnEdit, @"/DXEditors_HowToCreateButtonEdit;component\plus.png");
        }

        private void CreateEditButton(ButtonEdit edit, string imgUri) {
            BitmapImage bitmap = new BitmapImage(new Uri(imgUri, UriKind.Relative));
            Image imgSource = new Image() { Source = bitmap };
            ButtonInfo btnInfo = new ButtonInfo() { GlyphKind = GlyphKind.User, Content = imgSource };
            edit.Buttons.Add(btnInfo);
        }
    }
}

Imports Microsoft.VisualBasic
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media.Imaging
Imports DevExpress.Xpf.Editors

Namespace DXEditors_HowToCreateButtonEdit
    ''' <summary>
    ''' Interaction logic for MainWindow.xaml
    ''' </summary>
    Partial Public Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
            CreateEditButton(btnEdit, "/DXEditors_HowToCreateButtonEdit;component\plus.png")
        End Sub

        Private Sub CreateEditButton(ByVal edit As ButtonEdit, ByVal imgUri As String)
            Dim bitmap As New BitmapImage(New Uri(imgUri, UriKind.Relative))
            Dim imgSource As New Image() With {.Source = bitmap}
            Dim btnInfo As New ButtonInfo() With {.GlyphKind = GlyphKind.User, .Content = imgSource}
            edit.Buttons.Add(btnInfo)
        End Sub
    End Class
End Namespace

<Window x:Class="DXEditors_HowToCreateButtonEdit.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors">
    <Grid>
        <dxe:ButtonEdit 
            HorizontalAlignment="Left" Margin="176,129,0,0" Height="22"
            Name="btnEdit" VerticalAlignment="Top" Width="150" />
    </Grid>
</Window>