Control:
Timebase Command Button

Use this control to assign a timebase-related command to a button. You can then execute the command by clicking the button. For example, if you assign the command Create Program to a timebase command button, clicking the button opens the Program Wizard. If User Mode is enabled, you must have the appropriate privilege before you can create or modify timebase command buttons.

Also, refer to How to:  Creating a Timebase Command Button.