[TYPO3-mvc] How to use f:form.checkbox

[Steffen Ritter]

Hey folks,

i do not get the viewhelper f:form.checkbox to work...

I defined <f:form.checkbox property="active" /> in the Template
The checkbox is always checked, no matter what the  value of the object 
is. Unsetting the checkbox does not change anything at the object.

<f:if condition="{object.active}">Active</f:if> shows,that de getter 
works as expected and the value ist defined differently in different 
objects.

What I'm getting wrong?

regards

Steffen