How is the tab order for form fields in the Flash player determined?
Tab order for editable text fields and buttons is controlled entirely by the Flash player. There is currently no way to specify your own tab ordering.
How tab order is determined
The Flash player uses a formula to calculate the tab order of editable text fields and buttons that is essentially left to right and then top to bottom. The formula is:
k_x * x + k_y * y
where x and y are the x-coordinate and y-coordinate of the upper left corner of the text field or button (based on the upper left corner of the movie). If the fields or buttons are in a movie clip, the movie clip position is taken into account. The values of k_x and k_y are constant:
k_x = 1/3 k_y = 2
Note: This formula is calculated dynamically. That means that if you have text fields or buttons in a movie clip, and that movie clip is dragged, this can alter the tab ordering.
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