Open form to edit record in subform

Hi,

I have a form with a small subform. The multipe records subform contains only a few fields from the table. The table contains a text field, which is not in the subform. From the subform I want to open another form to edit all the details of the table, including the textfield as HTML editor field.
I have created an Application link in the subform, but the new form opens within the iframe of the subform, which is far to small. How to open just a new linked form from the subform?

Thanks in advance,
Martin Schaap