How do I implement drag-scroll as is done in Excel and Word?

I have a panel control that contains multiple copies of a user control I created. The panel control automatically displays scrollbars when there are too many user controls to fit in its display area. This is correct behavior.

I have implemented drag-drop of data between the user controls. This works correctly. However, when I need to drag from one to the other and the target user control is not visible, I need the panel control to automatically begin scrolling when the mouse is moved out of the panel during the drag operation so that the hidden control will scroll into view. This is the same as is done in Excel or Word when a user drags information outside the boundaries of the document.

I could probably use the panel's ScrollControlIntoView method, but for some reason, this does not work. No matter how much I have played with it, I get no autoscrolling to the control that should be visible.

Thanks in advance!