private void SelectedTask(object sender, ItemTappedEventArgs e)
{
var task = (TodoItem)listViewTasks.SelectedItem;
EditTask editTask = new EditTask(listTasks, listCategory, task);
//listViewTasks.SelectedItem = null;
Navigation.PushAsync(editTask);
}
private void AddTask_Clicked(object sender, EventArgs e)
{
EditTask editTask = new EditTask(listTasks, listCategory, new TodoItem(this.Title, "", 0));
Navigation.PushAsync(editTask);
}