Time Editor Weight contextual menu

To view the Weight contextual menu

Create New Expression
Opens the Expression Editor, where you can control the weight attributes.
Set Key
Sets a keyframe at the point in the animation in the Time Editor shown by the Current Time Indicator. These keys affect only the animation clip in the Time Editor Track View and do not affect the original Animation Source.
Set Driven Key
Opens the Set Driven Key window.
Create New Texture
Opens the Create Render Node window.
Lock Attribute
Freezes the Track Weight value so you cannot edit it.