GUI animated button doesn't get flipped frames ??

[Marion]

Hi Everyone
I am making a new game. I have made a GUI with an animated button on it. But my original graphics did not face the right direction, so I have flipped every loop that will be used by this button. But sadly the button doesn't display the frames using the flipped option ! They are the original, non-flipped versions of the graphics, facing then the wrong direction.
I can't flipped manually all the graphics because there are hundreds of them to make the animations. Is there a way I can force the button to be animated with the flipped loops ?
Thank you very much

[Snarky]

Yes, it's possible using dynamic sprites, by reading the frame flipped property and flipping the dynamic sprite if true.

[Marion]

Oh, okay, thank you very much !