Required validator on elements in ContentArea does not fire

Hi,

I have a problem regarding the Required validator on basic elements (or other validators for that matter).

I have created a custom Form element based on ElementBlockBase, which contains a label and a ContentArea. 
The elements in the ContentArea are rendered properly, but if I attach a Required Validator to a Textbox Element, for example, then that validator is not checked when submitting the form.

I checked the ValidationInfo of the Form and the validators from the ContentArea are nowhere to be found.

Is this a bug? 
I have looked for ways to manually add the Validator to the form to be checked, but I cannot find anything