follow the doc,
http://books.zkoss.org/wiki/ZK_Spreadsheet_Essentials/Working_with_ZK_Spreadsheet/Implement_ZK_Spreadsheet_Event_Listeners/Hyperlink_Event
and running zss essential http://localhost:8080/zssessentials/events/hyperlinkevent.zul
when I clicking on A2, it link to the web site directly.

Reproducing Steps:

1. enter a hyperlink in a cell, e.g. http://www.zkoss.org
2. click address bar's input box to make selection frame disappear. Now the cursor focus is inside the address bar.
3. move cursor to the hyperlink and click.

Expected:
As normal case, open a new tab to specified hyperlink address

Actual:
The current page changes to specified hyperlink address.