>If I create a web user control based on the MM.NET Web user control, how do I access the properties, etc of this class on the web form that the user control is placed?

(1) Set a reference to the user control in the Web Form.

<%@ reference control="~/VideoPlayer.ascx" %>

(2) Expose your private variables as public properties, using setters in the control. (You can also expose Web Control values in your user control through these setters.)

private int id;

public int Id
{
  set
  {
    id = value;
  }
}

(3) The opposite also works in the control, but you cannot do both. You'll get a circular reference error.

<%@ reference page="~/Default.aspx" %>

Also, you're probably already are aware of this, but your user control should inherit from mmUserControl, and here's how you register MM.NET business objects in the user control:

category = (Category)BusinessWebPage.RegisterBizObj(new Category());