New child resource 'down' for pressed buttons

[jovial_mood]

I'd like to request a new child resource for buttons.

For example, if I use a button resource and then add a child resource named 'enter', the later would be used for the button's highlighted state.
What I also would like is another similar child resource named 'down' which could be used for a button's pressed state.

For an example how it could be used, take a look at http://www.xlobby.com/forum/viewtopic.php?t=3275.

Thanks