public MySpecialitiesPage()
{
InitializeComponent();
MytaginfoList = uih.GetMyTagsByID(Settings.UserId);
Alltagslist = th.GetTagList();
SelectSkills.ItemsSource = Alltagslist;
SelectSkills.SelectedItems = MytaginfoList;
SelectSkills.DisplayMember = "Pcategory";
SelectSkills.Title = "My Skills";
SelectSkills.UseAutoValueText = true;
SelectSkills.KeepSelectedUntilBack = true;
SelectSkills.SelectedCommand = new Command(RefreshTag);
BindingContext = this;
}