Form Components

I wonder what collection of form the ole or sqldbcommands belong to? I want to loop through all the commands that belong to the form and set a property of them. Obviously they are not among controls of the from. I thought they belong to form Components but I cant get the Components of the form at run time, it returns Null. How can I get that?

The dont belong to any collection. The are just classes, unless you specifically code them into Collections.

How can i code it? What about other componnets? Why is this
Private components As System.ComponentModel.IContainer
needed, and what does it exaclty do?