function or widget for colored frame

[jscym singnet com sg]

Hi,

I would like to find out if gtk has a function or widget that enables the developer to draw a colored squared 
frame onto the gtk drawing area widget?

What I am doing now is very primitive as in I alter the individual pixels value geometrically to generate a 
square box.

To give an idea of my application, I will be displaying a RGB image on a drawing area in a window. When I 
click on an object in image, I would like to display a red frame that "boxes" up the specified portion of the 
image.

So is there a function or what that does the job real neat?

Thanks
Jason