xfa.resolveNode

Hi , Appreciate if I could get any help on these two problems.

1. how to get a message box pop up on iphone - I used the syntax xfa.host.messageBox(); , it works perfectly on desktop

2. xfa.resolveNode(); does not get the values from the node on iphone , it works perfectly on desktop

example:

var tax = xfa.resolveNode("Sample.TaxRate");

Thanks