The list Categories: contains the set of categories of the T‑FLEX CAD commands. The sets of icon buttons in the Commands area are updated upon categories selection.
A special category User Commands includes into itself user's commands, defined in the dialog box of the command Setting > User Commands.
The tab Commands: contains the list of the commands, included into a selected category. To add a command to a toolbar, simply drag the button by the cursor, using , to the desired toolbar.