missing 'SelectedHover' not fall back to 'SelectedNormal'

[zaexage]

according to http://cegui.org.uk/docs/current/fal_wr ... ref_sec_16,
Falagard/ToggleButton should fall back to 'SelectedNormal' if 'SelectedHover' state imagery not found.
However, if we only have 'Hover' but miss 'SelectedHover', then FalButton will accepted 'Hover', and FalToggleButton will add 'Selected' to make 'SelectedHover', which doesn't exist.

I think the doc should be updated or some minor change should be made in FalToggleButton;

[CrazyEddie]

It should fall-back if the docs say this, so if it does not it is a bug. I have added a ticket and will look into it soon.