Command ID: 21 (also see Tabstop Category )
Adds a tab stop. This method works with selections or the current paragraph.
paramA = position in twips
paramB, low byte, the mode (left, right, center, decimal)
paramB, high byte, the fill mode (no fill, dots, MDots, hyphen, underline, THyphen, EqualSign, Arrow)
Command ID: 22
Deletes the tab stop at position paramA
Command ID: 23
Clears all tabs tops in the selected text or the current paragraph.