TVML - how to modify formTemplate to show "pin entry"
Solution 1:
Use secure attribute in textField
https://developer.apple.com/library/tvos/documentation/LanguagesUtilities/Conceptual/ATV_Template_Guide/TVJSAttributes.html#//apple_ref/doc/uid/TP40015064-CH42-SW37
<textField keyboardType="numberPad" secure="true">0000</textField>