private Task CollapseNumberInputField()
{
var textLength = CardNumberInputTextBox.Text.Length;
var rectFromCharacterIndex = CardNumberInputTextBox.GetRectFromCharacterIndex(textLength - 5, true);
var numberInputFieldOffset = -rectFromCharacterIndex.X;
NumberInputSlideTimeline.To = numberInputFieldOffset;
var numberFieldAnimation = NumberInputSlideStoryboard.BeginAsync();
var dataFieldAnimation = DataInputSlideStoryboard.BeginAsync();
return(Task.WhenAll(numberFieldAnimation, dataFieldAnimation));
}
