I love DevExpress controls.  They do so much for you.... of course, the flip side is that there are so many properties and methods that even the simplest tasks can be a bit daunting.

One of the most common tasks when dealing with grids would be to set up a Master-Detail relationship.  For my own future reference I've written down the properties and methods involved in setting this up at design-time.

• Add Grid [Grid_Master]
• Set up columns
• Grid_Master.SettingsDetail.ShowDetailRow = true
• Smart Tag -> Edit Template -> Detail Row.
• Add Detail Grid here [Grid_Detail]
• Grid_Detail.SettingsDetail.IsDetailGrid = true

If using custom databinding, hook up Grid_Detail.Databinding event.  In Grid_Detail.Databinding, add similar code to the following:

            //The detail data is the assets that make up each Purchase Order
            ASPxGridView detailGrid = (ASPxGridView)sender;
            detailGrid.KeyFieldName = "ID";
            int id = (int)detailGrid.GetMasterRowKeyValue();
            DataTable table = new DataTable();
            table.Columns.Add("ID", typeof(int));
            table.Columns.Add("AssetTypeName", typeof(string));
            table.Columns.Add("SerialNumber", typeof(string));
            table.Columns.Add("SalesPrice", typeof(float));
            table.Columns.Add("Location", typeof (string));
            table.Columns.Add("Discount", typeof (float));

            Invoice invoice = InvoiceModel.GetInvoiceForID(id);
            if (invoice != null)
            {
                foreach (AssetItem asset in invoice.MyInvoiceItems)
                {
                    table.Rows.Add(new object[] { asset.ID, 
                      asset.AssetTypeName, asset.SerialNumber, asset.SalesPrice, 
                    asset.Location, asset.Discount});
                }

                detailGrid.DataSource = table;
            }