Binding DataGrid to DataTable. DataGrid's ItemSource is null on first load. - WPF

private DataTable _data;
public DataTable Data
{
    get => _data;
    set
    {
        _data = value;
        OnPropertyChanged();
    }
}

// called in VM's constructor. Also tried calling it in the view's code-behind in loaded event.
public void LoadData()
{
    Data = new DataTable();
    Data.BeginLoadData();

    // adding columns using Data.Columns.Add
    // adding rows using Data.Rows.Add

    Data.EndLoadData();
}

<DataGrid
    x:Name="AttributesGrid"
    IsReadOnly="True"
    ItemsSource="{Binding Data, IsAsync=True}"/>