The old post and nothing helped here. I tried everything, including to force it. Select () e.Focus () on the controls. For some reason, the taborn behaved in a funny manner, even turning off / setting visible = false on one control of the other orders was wrong, as if the tab index worked in the opposite order.
The only thing was the help documentation, you can open this field using Ctrl + W, U or the menu on VS.
BROWSE β Other Windows β Document Structure
It does not show your controls well in the tree. Just drag the controls in the correct order, this will affect the order of the tabs.
A word of warning: I dealt with this a bit, because dragging (in the "Document Structure" field) of some controls inside the panel made them move to the upper upper corner of the panel (in the designer). Just drag them back to the position in the constructor.
For some reason, the order they control is displayed in the Outline Dcouemnt block, which affects tab behavior in unpleasant ways.
source share