refer to the code below, if spreadsheet src was empty, set new src doesn't work as expect

<zk>
<button label="Set Src"
onClick='ss.src = "/xls/ZSS-demo_sample.xlsx"' />
<spreadsheet id="ss" maxrows="200" maxcolumns="40" vflex="true"
width="100%">
</spreadsheet>
</zk>