small_increment
Programmable Dialog Box Reference
tab_truncate
tabs = "string";
Specifies the placement of tabs in character width units. Possible value is a quoted string containing integers or floating-point numbers, separated by spaces (no default). These values are used for vertically aligning columns of text in a popup_list or list_box.
For example, the following code specifies a tab stop at every 8 characters.
tabs = "8 16 24 32";