Is there a way to maintain something in the header topmost?
Yes. Here are the instructions (pay attention to the parts I have marked in bold).
Note:
- This is for Word 2007 but it should be similar in Word 2010.
If you have pictures, shapes, or other objects that are grouped or
stacked on top of each other, you can move objects or groups of
objects up or down within the stack one layer at a time, or you can
move them to the top or bottom of a stack in one move.
Click the picture, shape, text box, or WordArt that you want to move up or down in the stack.
Try to click a part of the object that
is not obscured by another object in the stack.
If you can’t select
the object that you want, you may need to move other objects that are
currently above it in the stack first.
Do one of the following:
To move a picture, under Picture Tools, click the Format tab.
To move a shape, text box, or WordArt, under Text Box Tools, click the Format tab.
In the Arrange group, do one of the following:
To bring an object one step closer to the front, click the arrow next to Bring to Front, and then click Bring Forward.
To bring an object to the front, click the arrow next to Bring to Front, and then click Bring to Front.
To send an object one step toward the back, click the arrow next to Send to Back, and then click Send Backward.
To send an object to the back, click the arrow next to Send to Back, and then click Send to Back.
Source Move a picture, shape, text box, or WordArt