private void bt1_Click(object sender, System.Windows.RoutedEventArgs e)
		{
			Button bt1 = (Button)sender;
            DoubleAnimation dAnimation = new DoubleAnimation();
            dAnimation.From = 0;
            System.Console.WriteLine("width " + bt1.Width);
            dAnimation.To = 150;//// bt1.Width - 5
           // db1.Duration = TimeSpan.FromSeconds(5);
            bt1.BeginAnimation(Button.WidthProperty, dAnimation);
           
        }

'NaN' is not a valid value for property 'To'.