TeamMatesViewModel.cs

TeamMateSquad = new ObservableCollection<TeamMateItem>(new List<TeamMateItem>()
{
    new TeamMateItem()
    {
        Name = "First TeamMate",
        Level = 0
    },
    new TeamMateItem()
    {
        Name = "Second TeamMate",
        Level = 1
    },
    new TeamMateItem()
    {
        Name = "Third TeamMate",
        Level = 2
    }
});