why is tynamo rich text editor overriding the datefield?

Hi I'm trying to create rich text edit form, so I want to use tynamo. I have the following code:

<div class="t-beaneditor-row">
<label>Date:</label>
<t:DateField t:value="date" />
</div>

<div class="t-beaneditor-row">
<t:textarea t:value="text" t:mixins="tynamo/ckeditor"
parameters="{'toolbar': 'Full'}" />
</div>

So the richtext field is shown and looks ok, but the datafield data picker disappeared. Removing the mixin and the data picker is there. What is overriding the datefield behavior and how to prevent this?