Tab containers are created for the complex types decorated with TabAttribute.

using Xarial.XCad.Base.Attributes;
using Xarial.XCad.Documentation.Properties;
using Xarial.XCad.UI.PropertyPage.Attributes;

public class TabDataModel
{
    [Tab]
    [Icon(typeof(Resources), nameof(Resources.OffsetImage))]
    public class TabControl1
    {
        public string Field1 { get; set; }
    }

    public TabControl1 Tab1 { get; set; }

}

Tab with nested groups

Controls can be added directly to tabs or can reside in the nested groups:

public class TabControl2
{
    public class Group1
    {
        public int Field2 { get; set; }
    }

    public Group1 Group { get; set; }
    public bool Field3 { get; set; }
}

[Tab]
public TabControl2 Tab2 { get; set; }