[DXCategory("CustomDraw")]
public event RowObjectCustomDrawEventHandler CustomDrawGroupRow

<DXCategory("CustomDraw")>
Public Event CustomDrawGroupRow As RowObjectCustomDrawEventHandler

using DevExpress.XtraEditors;
using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Views.Base;
using DevExpress.XtraGrid.Views.Grid.ViewInfo;
using System.Collections.Generic;

namespace DXApplication {
    public partial class Form1 : XtraForm {
        public Form1() {
            InitializeComponent();
            gridControl1.DataSource = new List<DataItem>() {
                new DataItem(){ FirstName = "Bob", LastName = "Smith" },
                new DataItem(){ FirstName = "Ann", LastName = "Miller" },
                new DataItem(){ FirstName = "Sandra", LastName = "Moore" },
                new DataItem(){ FirstName = "Samuel", LastName = "Brown" },
            };
            Load += Form1_Load;
            gridView1.CustomDrawGroupRow += gridView1_CustomDrawGroupRow;
            gridView1.OptionsView.ShowGroupedColumns = true;
        }
        void Form1_Load(object sender, System.EventArgs e)
        {
            gridView1.Columns["FirstName"].GroupIndex = 0;
            gridView1.Columns["FirstName"].GroupInterval = ColumnGroupInterval.Alphabetical;
        }
        void gridView1_CustomDrawGroupRow(object sender, RowObjectCustomDrawEventArgs e)
        {
            GridGroupRowInfo info = e.Info as GridGroupRowInfo;
            if (info.Column.FieldName == "FirstName")
                info.GroupText = info.GroupValueText;
        }
    }
    public class DataItem {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
}

Imports DevExpress.XtraEditors
Imports DevExpress.XtraGrid
Imports DevExpress.XtraGrid.Views.Base
Imports DevExpress.XtraGrid.Views.Grid.ViewInfo
Imports System.Collections.Generic

Namespace DXApplication
    Partial Public Class Form1
        Inherits XtraForm

        Public Sub New()
            InitializeComponent()
            gridControl1.DataSource = New List(Of DataItem)() From {
                New DataItem() With {
                    .FirstName = "Bob",
                    .LastName = "Smith"
                },
                New DataItem() With {
                    .FirstName = "Ann",
                    .LastName = "Miller"
                },
                New DataItem() With {
                    .FirstName = "Sandra",
                    .LastName = "Moore"
                },
                New DataItem() With {
                    .FirstName = "Samuel",
                    .LastName = "Brown"
                }
            }
            AddHandler Load, AddressOf Form1_Load
            AddHandler gridView1.CustomDrawGroupRow, AddressOf gridView1_CustomDrawGroupRow
            gridView1.OptionsView.ShowGroupedColumns = True
        End Sub
        Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs)
            gridView1.Columns("FirstName").GroupIndex = 0
            gridView1.Columns("FirstName").GroupInterval = ColumnGroupInterval.Alphabetical
        End Sub
        Private Sub gridView1_CustomDrawGroupRow(ByVal sender As Object, ByVal e As RowObjectCustomDrawEventArgs)
            Dim info As GridGroupRowInfo = TryCast(e.Info, GridGroupRowInfo)
            If info.Column.FieldName = "FirstName" Then
                info.GroupText = info.GroupValueText
            End If

        End Sub
    End Class
    Public Class DataItem
        Public Property FirstName() As String
        Public Property LastName() As String
    End Class
End Namespace

using DevExpress.XtraGrid.Views.Base;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraGrid.Views.Grid.ViewInfo;

gridView1.OptionsView.AllowHtmlDrawGroups = true;

private void gridView1_CustomDrawGroupRow(object sender, RowObjectCustomDrawEventArgs e) {
    GridView view = sender as GridView;
    GridGroupRowInfo info = e.Info as GridGroupRowInfo;
    if (info.Column.Caption == "Quantity") {
        int quantity = Convert.ToInt32(view.GetGroupRowValue(e.RowHandle, info.Column));
        string colorName = getColorName(quantity);
        info.GroupText = info.Column.Caption + ": <color=" + colorName + ">" + info.GroupValueText + "</color> ";
        info.GroupText += "<color=LightSteelBlue>" + view.GetGroupSummaryText(e.RowHandle) + "</color> ";
    }
}

string getColorName(int value) {
    if (value < 20) return "MediumOrchid";
    if (value >= 80) return "OrangeRed";
    return "Blue";
}

Imports DevExpress.XtraGrid.Views.Base
Imports DevExpress.XtraGrid.Views.Grid
Imports DevExpress.XtraGrid.Views.Grid.ViewInfo

gridView1.OptionsView.AllowHtmlDrawGroups = True

Private Sub GridView1_CustomDrawGroupRow(sender As System.Object, _
    e As RowObjectCustomDrawEventArgs) Handles GridView1.CustomDrawGroupRow
    Dim view As GridView = TryCast(sender, GridView)
    Dim info As GridGroupRowInfo = TryCast(e.Info, GridGroupRowInfo)
    If info.Column.Caption = "Quantity" Then
        Dim quantity As Integer = Convert.ToInt32(view.GetGroupRowValue(e.RowHandle, info.Column))
        Dim colorName As String = getColorName(quantity)
        info.GroupText = info.Column.Caption & ": <color=" & colorName & ">" & info.GroupValueText & "</color> "
        info.GroupText &= "<color=LightSteelBlue>" & view.GetGroupSummaryText(e.RowHandle) & "</color> "
    End If
End Sub

Private Function getColorName(ByVal value As Integer) As String
    If value < 20 Then
        Return "MediumOrchid"
    End If
    If value >= 80 Then
        Return "OrangeRed"
    End If
    Return "Blue"
End Function

using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraGrid.Views.Base;
using DevExpress.XtraGrid.Views.Grid.ViewInfo;
using System.Drawing.Drawing2D;

private void Form3_Load1(object sender, EventArgs e) {
    CustomDrawGroupRow(gridControl1, gridView1);
}

public static void CustomDrawGroupRow(GridControl gridControl, GridView gridView) {
    gridView.Columns["Category_Name"].Group();

    // Handle this event to paint group rows manually
    gridView.CustomDrawGroupRow += (s, e) => {
        if (e.RowHandle % 2 == 0) {
            e.Appearance.BackColor = Color.BlanchedAlmond;
            e.Appearance.ForeColor = Color.DimGray; ;
        }
    };
}

Imports DevExpress.XtraGrid.Views.Grid
Imports DevExpress.XtraGrid.Views.Base
Imports DevExpress.XtraGrid.Views.Grid.ViewInfo
Imports System.Drawing.Drawing2D

Private Sub Form3_Load1(ByVal sender As Object, ByVal e As EventArgs)
    CustomDrawGroupRow(gridControl1, gridView1)
End Sub

Public Shared Sub CustomDrawGroupRow(ByVal gridControl As GridControl, ByVal gridView As GridView)
    gridView.Columns("Category_Name").Group()

    ' Handle this event to paint group rows manually
    AddHandler gridView.CustomDrawGroupRow, Sub(s, e)
        If e.RowHandle Mod 2 = 0 Then
            e.Appearance.BackColor = Color.BlanchedAlmond
            e.Appearance.ForeColor = Color.DimGray

        End If
    End Sub
End Sub

{
    view.CustomDrawGroupRow += OnCustomDrawGroupRow;
    view.MouseDown += OnMouseDown;

view.CustomDrawColumnHeader += new ColumnHeaderCustomDrawEventHandler(View_CustomDrawColumnHeader);
view.CustomDrawGroupRow += new RowObjectCustomDrawEventHandler(View_CustomDrawGroupRow);
view.CustomUnboundColumnData += new CustomColumnDataEventHandler(view_CustomUnboundColumnData);

Public Sub EnableGroupEditing()
    AddHandler view.CustomDrawGroupRow, AddressOf OnCustomDrawGroupRow
    AddHandler view.MouseDown, AddressOf OnMouseDown

AddHandler view.CustomDrawColumnHeader, New ColumnHeaderCustomDrawEventHandler(AddressOf View_CustomDrawColumnHeader)
AddHandler view.CustomDrawGroupRow, New RowObjectCustomDrawEventHandler(AddressOf View_CustomDrawGroupRow)
AddHandler view.CustomUnboundColumnData, New CustomColumnDataEventHandler(AddressOf view_CustomUnboundColumnData)