Gradient’s parameters. 
Using the following tool

, represent another element colored in
005782 with the shown sizes next step.
Blending Options-Gradient Overlay
Gradient’s parameters. 
Show again the hidden layer before and place correctly the layers also.

Take again the indicated instrument

and represent the figure from below. You are finishing the header.

Fill 0% on the layers. The Opacity must be about 20%.
Blending Options-Gradient Overlay
Gradient’s parameters.

Use the same instrument

and insert a new figure(button for Menu) colored in
289FCE
Take now

for adding the next element (area for Left Menu) of our picture with the sizes demonstrated next step. Then use again

to erase the lowest part of the image.