sizing and centering modal forms

I had difficulties to work with modal forms. At my browser a form opens fine but a client had problems to reach the form buttons. It seems modal forms are browser settings dependent. Is there way to be sure a form opens always in the center and sized as designed?

Hello, maximnl

Look at my post (Grid with modal form and code in OnScriptInit problem) in Grid / Reports. I have a similar problem (in all browsers) that I could not solve. Could you solve it ?. Best regards, Ricardo