Recently I was working on a checklist box control, which was disabled but did not prevent the vertical scroll bar from appearing. As I had to to keep the checklist box disabled, I added a panel on to the checklist box, but still the horizontal scroll bar was visible. Please see the comparison in the picture.
The only resolution I could come was to hide the scroll bar of the checklist box from appearing. I wrote the following code and instantiated an object of it, and it did the trick.
class CustomCheckListBox : System.Windows.Forms.CheckedListBox
private const int WS_VSCROLL = 0x00200000;
protected override System.Windows.Forms.CreateParams CreateParams
System.Windows.Forms.CreateParams parms = base.CreateParams;
parms.Style &= ~WS_VSCROLL;