videoBox show() with effect ?

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When using show() function with an effect (whatever is the effect) on a videoBox element, the effect is not applied. However with ‘hide’ the effects work. Does ‘show()’ on videoBox supports using effects ?
For example, that does not play the fade effect:

$w('#mediaPlayer1').show('fade')

while that plays the fade effect correctly:

$w('#mediaPlayer1').hide('fade')

What’s wrong ?
Thanks.