You're not really clear about what you are trying to do.
You say you are trying to put a "background" "over" the tab. This is a
little contradictory.
You also don't say how you're trying to do this. If you put an image control
"over" the tab, well of course it covers the tab control. You can change the
order of the controls by going to the Format menu and using "Send to Back"
and "Bring to Front."
If your are setting the form's Picture property to set the background,
(which you should be doing instead of using an image control,) and your tab
controls are just hard to see, (not really being covered,) then the problem
is probably the tab control's Back Style property is set to Transparent
instead of normal.
If one of these things is not what's going on, post back and tell us:
1 - What you are trying to accomplish
2 - Exactly what you are doing
Good luck.
Sco