Cannot set focus when reset data using datasets

Hi All,

When I click reset form button. I would like to reset data then focus to the first field. I can clear information I provided but setFocus to the first name field is not working. Please help.

I use datasets to reset data. 

Here is my coding:
event: click

xfa.datasets.data.loadXML("<form1/>", true, true);

xfa.host.setFocus("xfa.form1.contactInformation.firstname")

Thanks,

Cindy