Tristate and linked controls
 

BsPlayer have tristate controls (ex. mute button) and linked controls (ex. mute button and volume slider).
May be expandlinked controls and tristate properties?
Example pause and playe button:
when playing movie change state "play". When press pause change state "pause". And when movie is paused pressed on play change state "play" and "pause" also?
May be You find more combinations...