The following methods are associated with the Trackbar:
Gets the previous key time. If no previous key is present, returns undefined .
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