Operation logic of the listbox when using hardware buttons.

[goddade]

I'm using three hardware buttons (prev, select, and next) to control my device. On the screen, there are several buttons and a listbox used to display a list of files.

I want to use prev or next to navigate/select files, and press select to open one.

The default logic is that I first need to navigate to the listbox and press select to give it focus before I can select an item.
After selecting an item and pressing select, the listbox only loses focus — there is no GSLC_TOUCH_UP_IN event, only two types: GSLC_TOUCH_FOCUS_PRESELECT and GSLC_TOUCH_FOCUS_SELECT.