While using the Basic Curves command, the tracking bar is missing.
Solution
1. With the Basic Curve dialog open, in the Menu, select 'Preferences-->User Interface'.
2. Highlight 'Layout'.
3. Select the 'Reset Window Position' icon.
The Tracking Bar pop-up should appear.
Notes and References
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: DESIGN
Version: V10.0.3
Function: CURVE
Ref: 001-9329517