Missing call of Post function generated by HTML to C

I have made an application that includes a HTML page with radio buttoms. I am using NET+OS 7.1 and Digi connect ME.
The html for the radio buttoms is:

A function void Post_slot(unsigned long handle) is generated by the HTML to C compiler. I can click the buttoms with my browser, but the Post_slot() is never called. I have inserted a breakpoint in this function that is never triggered.
Another HTML pages showing dynamic contents using the NZZA keywork works well, the web server is running.
Have anyone an idea of why the Post function is never called?