protected override void LoadChildren()
{
var usage = _solutionManager.GetNugetUsage(NugetPackage.Name);
foreach (var nversion in usage.GroupBy(x => x.Nuget.Version).OrderBy(x => x.Key))
{
Children.Add(new NugetVersionGroupViewModel(nversion.Key.ToString(), this, nversion));
}
base.LoadChildren();
}