Colored box that stretches through a line chart

[italoicm]

Hi,
I have a line chart in my application in which I want to add a colored box that marks certain points of the chart, as the attached image ilustrantes.
Can you give me some insight on which smartclient API or chart functions I should look into to solve this problem?
thanks in advance.

[Isomorphic]

It looks like you want this sample. Aside from the APIs shown there, also look at getDrawnValue() and related APIs linked in the docs.