[tryton] create_date on view

[Ivan Rodrigues]

Hello,

I added create_date field on a form.xml view and it not appears on screen, 
only its label. Why?

<?xml version="1.0"?>
<form string="Work Order">
    <notebook colspan="4">
        <page string="General" id="page_general">
    <label name="create_date"/>
            <field name="create_date"/>
            <label name="create_uid"/>
            <field name="create_uid"/>
        </page>
    </notebook>
</form>

The create_uid works fine.

Thanks,

Ivan