Sorry for my bad English
The virtual emulator 89 has the option of deploying multiple layers of skins according to key change (2nd, Control, Alpha, Shift)
I would like that this feature is incorporated into TiEmu
TI89 emulation on windows phone
http://www.windowsphone.com/en-us/store ... 0b49354987
Standard & original Shell ti 89

With Shift key

With Control key

The following skin is too complicated, as it separated by function key operation is facilitated
Full Keyboard

3D Skin
