Control order
From REALbasicWiki
When a window is displayed in the IDE pressing the "Show control order" button beneath the row of tabulators labels each control with a running number, starting with 0, on yellow squares.
This order determines which control receives focus when the keyboard's tab key is pressed.
The initial order is determined by the order the controls are added to the window. The control order can be modified for each control in the Position group of the properties pane on the right.
For controls that cannot receive focus this property is not relevant.
Programming Note: Control order cannot be changed at run time. Controls added at run time (by using a Control array) have a tab order after the last item in the list. If you want to change the apparent order at run time, you can do it with code and the KeyDown() event for the controls. If the Key is a tab, then set the focus to the next control you decide, and return True to prevent the framework from processing the key just pressed.
