Fixed #329

Author: Helder Carvalho

MaterialDesignThemes.Wpf/PopupBox.cs

@@ -579,12 +579,6 @@ private void AnimateChildrenIn(bool reverse)
                 uiElement.SetCurrentValue(RenderTransformOriginProperty, new Point(.5, .5));
                 uiElement.RenderTransform = transformGroup;
 
-                var opacityAnimation = new DoubleAnimationUsingKeyFrames();                
-                opacityAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(0, absoluteZeroKeyTime, sineEase));
-                opacityAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(0, deferredStartKeyTime, sineEase));
-                opacityAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(1, deferredEndKeyTime, sineEase));                
-                Storyboard.SetTargetProperty(opacityAnimation, new PropertyPath("Opacity"));
-                Storyboard.SetTarget(opacityAnimation, uiElement);
 
                 var scaleXAnimation = new DoubleAnimationUsingKeyFrames();
                 scaleXAnimation.KeyFrames.Add(new EasingDoubleKeyFrame(0, absoluteZeroKeyTime, sineEase));
@@ -609,7 +603,6 @@ private void AnimateChildrenIn(bool reverse)
                 Storyboard.SetTarget(translateCoordinateAnimation, uiElement);
 
                 var storyboard = new Storyboard();
-                storyboard.Children.Add(opacityAnimation);
                 storyboard.Children.Add(scaleXAnimation);
                 storyboard.Children.Add(scaleYAnimation);
                 storyboard.Children.Add(translateCoordinateAnimation);