You can connect the querySelection action to an event, such as the clicking of a push button, and then connect the result of the event-to-action connection to a list item.
The setFocus action acts differently depending on which part is receiving the action. For example, if you connect the setFocus action to a Window part, the window comes to the foreground and is the active window. Or, if you connect the setFocus action to a Text part in a window, the cursor is moved to this field.