Make your default Materials Slots as Vray in 3ds Max

3ds Max Materials Editor slots is standard in default, but when we change Render engine to Vray, still we need every time to replace standard slot to Vray manually, so to save time we can make the default slots on Materials editor to be always as Vray. To activate  that just do the following :

 
Vray slots default
Vray Materials slots
Vray Materials

Updated Notice: 
In 3ds Max 2020, Custom UI and Defaults Switcher is changed to Configure project paths