TYPO3.Fluid

I have a Section :

<f:section name="defaultSearch">
<f:form.textbox name="text" class="date" value="" />
</f:section>

my html output is right...

<input type="text" name="tx_myext_pi1[text]" value="" />

and i use the renderViewHelper to show the section

<f:render section="defaultSearch" />

my html output is wrong (without the "tx_myext_pi1" prefix) ...

<input type="text" name="text" value="" />

any ideas who i find the bug?