How to setinlineDTMFGrammar() method in VMenuField

Hi All, I'm unable to handle VGrammar methods , especially setInlineDTMF() method. In my requirement I need only two dtmf values say 2 or 3 should accept by this grammar, If user press other than this element should throw nomatch event, In my code I'm using inlinegrammar like this

VGrammar dtmfGrammar = VGrammar.getNew(sessionAPI.getPreference());

String arr[]={"2","3"};

dtmfGrammar.setDtmfInline(arr);

but when I call this method, it accepts all dtmf keys [0-9].

I'm testing this element through debugger. Is this get works in debugger? I'm attaching my code. Can any one help  me out.

Thank you.

You might try an array of objects.

Such as setDtmfInline[/i:d7f4e8b385]

thank you very much edwin