Stretching colorbox to the end of line

Question

I was just making my resume and I wanted to highlight the different sections. I used the color package. This is the code:

\usepackage{color}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}


\colorbox{Cyan}{\underline{\textbf{Objective}}}

To work in areas like Embedded systems, Hardware Design in an established firm and to apply the knowledge for personal and professional benefit\

What I get is something like this:

What I want is this:

Any ideas?

Answer 1

 \colorbox{whatever}{\rlap{\textbf{Objective}}\hspace{\linewidth}\hspace{-2\fboxsep}}

Answer 2

Here's a definition of \Colorbox[<width>]{<colour>}{<stuff>} using xparse:

\documentclass{article}
\usepackage{xparse}% http://ctan.org/pkg/xparse
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}% http://ctan.org/pkg/xcolor
\makeatletter
\NewDocumentCommand{\Colorbox}{O{\dimexpr\linewidth-2\fboxsep} m m}{%
  \colorbox{#2}{\makebox[#1][l]{#3}}}
\makeatother
\begin{document}
\noindent\Colorbox{Cyan}{\textbf{Objective}}
\end{document}​

The default width <width> is \linewidth-2\fboxsep, where \fboxsep is the gap between the text and the colour box boundary.