Has anyone seen conditions under which the Padding property of a container is ignored?

I have a scenario in which I Programmatically create a TableLayoutPanel and programmatically populate it with controls. A GroupBox is programmatically created and the TableLayoutPanel programmatically added to it. The GroupBox is then programmatically added to an existing Panel control. I can programmatically set the Padding on the GroupBox control and set the Padding on the existing Panel control in the IDE. However, the controls that are added to these container controls are still butted up against the absoulte borders of the containers, which seems to indicate that the Padding property is being ignored for the containers.

Has anyone seen this or am I missing something here?

Thanks,
Bill