/// <summary>
/// Called each frame by Unity, checks to see if the user clicks/scrolls outside of
/// the dropdown while open, and closes it if so.
/// </summary>
internal void Update()
{
if (open && handler != null && !handler.IsOver && (PUIUtils.GetMouseButton(0) ||
PUIUtils.GetInputAxis("Mouse ScrollWheel") != 0.0f))
{
Close();
}
}