I have a control which contains a
NumericUpDown. The updown is only shown when the container has focus, so the container has to be selectable (or else it could never receive focus). I want the control to behave as a single entity with regards to tab order; that is, when the user tabs to the control, it shows the updown and the updown is focused; when the user tabs away from the updown, it is as if they had tabbed away from the control.
It's easy enough to achieve the first part: in the container's OnEnter, I focus the updown. If the user tabs away without shift, it also works fine, since the next control in the tab order is the correct one. However, the previous control in the tab order to the updown is the container, since it had to be selectable; so when the user shift-tabs away from the updown, the container is selected, and therefore the updown gets selected again.
How do I select the previous control to the container control, when the user shift-tabs away from the updown?
My problem isn't detecting when I need to do this – it's finding the control to send focus to.
SelectNextControl only seems to work within the container's parent's controls; if the container is the only control on its parent, it doesn't change focus, even if there are other controls elsewhere in the hierarchy that ought to receive focus via tab.
if you know the direction of the tab you could use
or you could use