WPF Gantt Control - Simplifying Project Scheduling

xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
<syncfusion:GanttControl ItemsSource="{Binding Tasks}">
    <syncfusion:GanttControl.DataContext>
        <local:GanttViewModel/>
    </syncfusion:GanttControl.DataContext>
</syncfusion:GanttControl>

public class GanttViewModel
{
    public ObservableCollection<TaskDetails> Tasks { get; set; }
    public GanttViewModel()
    {
        Tasks = this.GetTaskDetails();
    }
    private ObservableCollection<TaskDetails> GetTaskDetails()
    {
        ObservableCollection<TaskDetails> task = new ObservableCollection<TaskDetails>();
        task.Add(
            new TaskDetails
            {
                TaskId = 1,
                TaskName = "Scope",
                StartDate = new DateTime(2011, 1, 3),
                FinishDate = new DateTime(2011, 1, 14),
                Progress = 40d
            });

        task[0].Child.Add(
            new TaskDetails
            {
                TaskId = 2,
                TaskName = "Determine project office scope",
                StartDate = new DateTime(2011, 1, 3),
                FinishDate = new DateTime(2011, 1, 5),
                Progress = 20d
            });

        task[0].Child.Add(
            new TaskDetails
            {
                TaskId = 3,
                TaskName = "Justify project office via business model",
                StartDate = new DateTime(2011, 1, 6),
                FinishDate = new DateTime(2011, 1, 7),
                Duration = new TimeSpan(1, 0, 0, 0),
                Progress = 20d
            });

        task[0].Child.Add(
            new TaskDetails
            {
                TaskId = 4,
                TaskName = "Secure executive sponsorship",
                StartDate = new DateTime(2011, 1, 10),
                FinishDate = new DateTime(2011, 1, 14),
                Duration = new TimeSpan(1, 0, 0, 0),
                Progress = 20d
            });

        task[0].Child.Add(
            new TaskDetails
            {
                TaskId = 5,
                TaskName = "Secure complete",
                StartDate = new DateTime(2011, 1, 14),
                FinishDate = new DateTime(2011, 1, 14),
                Duration = new TimeSpan(1, 0, 0, 0),
                Progress = 20d
            });

        return task;
    }
}