The BlackBerry Tablet OS library's QNX TextInput for the PlayBook allows the developer to define which type of PlayBook Keyboard shows up upon focus.

This video shows the ActionScript source code as well as what the different keyboard types look like on the PlayBook simulator.
renaun.com/blog/2011/01/using-the-playbook-qnx-textinput-keyboardtype-and-returnkeytype

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