CFGRID does not display

I'm running CFMX 7on Windows. I couldn't get CFGrid to return any records, so I tried the CFGRID example on page 646 of the Development Guide:

<cfquery name="empdata" datasource="cfdocexamples">
SELECT * FROM Employee
</cfquery>
<cfform name="Form1" action="submit.cfm" >
<cfgrid name="employee_grid" query="empdata"
selectmode="single">
<cfgridcolumn name="Emp_ID">
<cfgridcolumn name="LastName">
<cfgridcolumn name="Dept_ID">
</cfgrid>
<br>
<cfinput name="submitit" type="Submit" value="Submit">
</cfform>

<cfdump> shows that there are records in the query, but the page displays nothing but the Submit button.

I apparently have the correct mapping for the JAVA class, because CF knows when I've made a syntax error within CFGrid.