private void LoadRolCBB()
{
ctx.Load(ctx.GetGebruikersRollenQuery()).Completed += (sender0, args0) =>
{
var source = ctx.GebruikersRollens.ToList();
RolCBB.ItemsSource = source;
RolCBB.SelectedValuePath = "Rol_ID";
RolCBB.DisplayMemberPath = "Rolnaam";
};
}
