The item's tab order, which can be any long integer equal to or greater than 0.

Tab order is the order in which form items get focus when the user presses the TAB key. Only items that can get focus can get a tab order value, for example, you cannot set a tab order for cells or columns.

Two items can have the same tab order, in which case the order is not guaranteed.

After a matrix receives the focus via the TAB key, each TAB key press moves the focus to the next cell in the matrix. When the last cell has the focus, the next TAB key press moves the focus to the first cell; you cannot tab out of a matrix object.

Matrix Object