Avalonia Scheduler, Gantt and Kanban as Native Controls

public class TMeeting
{
    public string Key { get; set; }
    public string Subject { get; set; }
    public DateTime Begin { get; set; }
    public DateTime End { get; set; }
    public string Owner { get; set; }
    public string Rule { get; set; }
}

public class TPerson
{
    public string Code { get; set; }
    public string Label { get; set; }
}

public class TTeamViewModel
{
    public ObservableCollection<TMeeting> Meetings { get; } = new ObservableCollection<TMeeting>();
    public ObservableCollection<TPerson> People { get; } = new ObservableCollection<TPerson>();

    public TTeamViewModel()
    {
        People.Add(new TPerson { Code = "ann", Label = "Ann" });
        People.Add(new TPerson { Code = "bob", Label = "Bob" });
        DateTime vMonday = DateTime.Today.AddDays(-(((int)DateTime.Today.DayOfWeek + 6) % 7));
        Meetings.Add(new TMeeting { Key = "m1", Subject = "Stand-up", Owner = "ann",
            Begin = vMonday.AddHours(9), End = vMonday.AddHours(9.25),
            Rule = "FREQ=DAILY;BYDAY=MO,TU,WE,TH,FR" });
        Meetings.Add(new TMeeting { Key = "m2", Subject = "Design review", Owner = "bob",
            Begin = vMonday.AddDays(2).AddHours(14), End = vMonday.AddDays(2).AddHours(15) });
    }
}

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sgc="https://www.esegece.com/sgcui"
        xmlns:local="using:TeamCalendar"
        x:Class="TeamCalendar.MainWindow"
        x:DataType="local:TTeamViewModel"
        Title="Team calendar" Width="1100" Height="720">
  <TabControl>
    <TabItem Header="Calendar">
      <sgc:TsgcAvaloniaScheduler x:Name="scheduler" View="psvWorkWeek" InplaceEdit="True"
                                 ItemsSource="{Binding Meetings}" ResourcesSource="{Binding People}">
        <sgc:TsgcAvaloniaScheduler.ItemFields>
          <sgc:TsgcAvaloniaPlannerItemFields IdField="Key" TitleField="Subject" StartField="Begin"
                                             FinishField="End" ResourcesField="Owner"
                                             RecurrenceField="Rule"/>
        </sgc:TsgcAvaloniaScheduler.ItemFields>
        <sgc:TsgcAvaloniaScheduler.ResourceFields>
          <sgc:TsgcAvaloniaPlannerResourceFields IdField="Code" NameField="Label"/>
        </sgc:TsgcAvaloniaScheduler.ResourceFields>
      </sgc:TsgcAvaloniaScheduler>
    </TabItem>
    <TabItem Header="Gantt">
      <sgc:TsgcAvaloniaGantt x:Name="gantt" ShowHistogram="True" ShowToday="True"
                             ItemsSource="{Binding Meetings}" ResourcesSource="{Binding People}">
        <sgc:TsgcAvaloniaGantt.ItemFields>
          <sgc:TsgcAvaloniaPlannerItemFields IdField="Key" TitleField="Subject" StartField="Begin"
                                             FinishField="End" ResourcesField="Owner"/>
        </sgc:TsgcAvaloniaGantt.ItemFields>
        <sgc:TsgcAvaloniaGantt.ResourceFields>
          <sgc:TsgcAvaloniaPlannerResourceFields IdField="Code" NameField="Label"/>
        </sgc:TsgcAvaloniaGantt.ResourceFields>
      </sgc:TsgcAvaloniaGantt>
    </TabItem>
  </TabControl>
</Window>

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        scheduler.Options.GroupByResource = true;
        scheduler.Options.SlotMinutes = 15;
        // a drag on an empty slot creates a meeting: name it here
        scheduler.OnItemCreate = DoItemCreate;
        // three tier timescale over the Gantt bars
        gantt.TimeScale.TierCount = 3;
    }

    private void DoItemCreate(object aSender, DateTime aStart, DateTime aFinish,
        string aResourceId, ref string aTitle, ref bool aAccept)
    {
        aTitle = "New meeting";
    }
}