public TextBox()
{
TextProperty = new BindableProperty <TextBox, string>(this, string.Empty);
KeyboardControlProperty = new BindableProperty <TextBox, bool>(this);
KeyboardControlProperty.OnPropertyChanged((t, orig, cur) => _needsKeyboardFocus = cur);
MaxLength = int.MaxValue;
VisibilityProperty.OnPropertyChanged((t, o, n) => { KeyboardControlProperty.Value = false; _hotControl = -1; }); //reset hot control when it goes invisible
}
