Splitcontrol Panel Horizontal Scrollbar not displaying with docked control

I have a Splitcontainer Panel with three controls; a datagridview and two custom controls.  Only one of the three is visible at a given time and when the are visible, they are docked to Fill the Panel. 

Here is the problem. 

When the datagridview displays, the Panel's scrollbars (horizontal and vertical) display.  But when the custom control displays only the vertical scrollbar visible. 

I've tried unsuccessfully to get the horizontal scrollbar to display while the Custom Control is Docked to Fill.  Yet, when the datagridview is set to Dock Fill, both scrollbars display fine . 

The Custom Control has AutoSize = True.  The Panel has AutoScroll = True

Any ideas how to get the horizontal scrollbar to display. 

Thanks

Tim

Tim Conway