using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraGrid.Views.Card;

GridControl grid = gridControl1;
// The pattern View for representing the "SuppliersProducts" relation.
GridView gridView1 = new GridView(grid);
// The pattern View for representing the "ProductsOrder_x0020_Details" relation.
GridView gridView2 = new GridView(grid);
// The pattern View for representing the "SuppliersCategoryProducts" relation.
CardView cardView1 = new CardView(grid);

GridLevelNode node1 = grid.LevelTree.Nodes.Add("SuppliersProducts", gridView1);
GridLevelNode node11 = node1.Nodes.Add("ProductsOrder_x0020_Details", gridView2);
GridLevelNode node2 = grid.LevelTree.Nodes.Add("SuppliersCategoryProducts", cardView1);

// Customize the pattern Views.
// ...

Imports DevExpress.XtraGrid
Imports DevExpress.XtraGrid.Views.Grid
Imports DevExpress.XtraGrid.Views.Card

Dim grid As GridControl = GridControl1
' The pattern View for representing the "SuppliersProducts" relation.
Dim gridView1 As GridView = New GridView(grid)
' The pattern View for representing the "ProductsOrder_x0020_Details" relation.
Dim gridView2 As GridView = New GridView(grid)
' The pattern View for representing the "SuppliersCategoryProducts" relation.
Dim cardView1 As CardView = New CardView(grid)

Dim node1 As GridLevelNode = grid.LevelTree.Nodes.Add("SuppliersProducts", gridView1)
Dim node11 As GridLevelNode = node1.Nodes.Add("ProductsOrder_x0020_Details", gridView2)
Dim node2 As GridLevelNode = grid.LevelTree.Nodes.Add("SuppliersCategoryProducts", cardView1)

' Customize the pattern Views.
'...

using DevExpress.XtraGrid.Views.Grid;
//...
private void frmMain_Load(object sender, System.EventArgs e) {
    // Create and customize a pattern View.
    GridView customPatternView = new GridView(gridControl1);            
    customPatternView.Columns.AddField("CategoryID").VisibleIndex = 0;
    customPatternView.Columns.AddField("Discontinued").VisibleIndex = 1;
    customPatternView.OptionsView.ShowGroupPanel = false;
    // Associate the pattern View with the "CustomRelation" name.
    gridControl1.LevelTree.Nodes.Add("CustomRelation", customPatternView);
}

// A MasterRowGetRelationName event handler for the master View.
private void advBandedGridView1_MasterRowGetRelationName(object sender, 
MasterRowGetRelationNameEventArgs e) {
    if(e.RowHandle == 0 && e.RelationIndex == 0)
        e.RelationName = "CustomRelation";
}

Imports DevExpress.XtraGrid.Views.Grid
'...
Private Sub frmMain_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles MyBase.Load
    ' Create and customize a pattern View.
    Dim customPatternView As GridView = New GridView(gridControl1)
    customPatternView.Columns.AddField("CategoryID").VisibleIndex = 0
    customPatternView.Columns.AddField("Discontinued").VisibleIndex = 1
    customPatternView.OptionsView.ShowGroupPanel = False
    ' Associate the pattern View with the "CustomRelation" name.
    gridControl1.LevelTree.Nodes.Add("CustomRelation", customPatternView)
End Sub

' A MasterRowGetRelationName event handler for the master View.
Private Sub advBandedGridView1_MasterRowGetRelationName(ByVal sender As Object, _
ByVal e As MasterRowGetRelationNameEventArgs) _
Handles advBandedGridView1.MasterRowGetRelationName
    If e.RowHandle = 0 And e.RelationIndex = 0 Then e.RelationName = "CustomRelation"
End Sub