The following methods are associated with the Trackbar:
gets the previous key time. If no previous key is present, returns undefined. For example:
at time sliderTime trackbar.getPreviousKeyTime()
gets the next key time. If no next key is present, returns undefined.
The following 3ds max system global variables are associated with the Trackbar:
get and set the filter specifying which types of keys to show in the Trackbar. The valid values are: #all, #TMOnly, #currentTM, #object, and #mat.
get and set whether the trackbar is visible - true if the trackbar is visible, false if invisible