Change the alpha value of the player window to make it more or less transparent.
First available in version 3.0 build 2039.
percent - Alpha value expressed as a percentage from 0 to 100, where 0 is fully transparent (invisble) and 100 is fully opaque.
alpha - [Optional] - Alpha value expressed as a raw alpha value from 0 to 255, where 0 is fully transparent (invisible) and 255 is fully opaque. If this value is present it will overwride the percent argument.
No output parameters.
When this method is called synchronously, a return object containing the output parameters is returned to the caller immediately.