showModalDialog and postbacks in custom aspx pages in Microsoft Dynamics CRM 4.0

I've developed a custom aspx dialogue page. It has button with postback and when this button is clicked - action is executed but new window is opened. Solution for this case is to add <base target="_self"/> tag under head tag.

Custom workflow action, team members and 'to' field of email record for Microsoft Dynamics CRM 4.0

There was interesting question and I decided to help author of question and create such functionality.