Rewrite DemoPassword

[mbaas2]

The following callbacks in #.demo have either been deleted or never existed - I thought it might be worth mentioning.

• onISelect: used in Demo_Issue79, Demo_Issue105, DemoPassword
• onGotFocus: same
• onKeyPress: same

[mkromberg]

The current example was ripped out of a client application and is "out of context".