Rightclicking on Div (infobox) is Disabled. How do I enable it

I am using the Infobox plugin for Google Maps V3 API. http://google-maps-utility-library-v3.googlecode.com/svn/trunk/infobox/docs/reference.html

Problem: When I rightclick on the infobox div, nothing happens. Same goes for any div that is the child of the parent infobox div. However I have an input box that contains some text that I want to be able to select and rightclick copy.

How can this be done if I cannot rightclick on it? More importantly, how can I enable right clicking?

Example

http://google-maps-utility-library-v3.googlecode.com/svn/trunk/infobox/examples/infobox-basic.html

JS Code Does not work

var infoboxOptions = {
    content: boxText,
    disableAutoPan: true,
    maxWidth: 0,
    pixelOffset: new google.maps.Size(0, 0),
    zIndex: null,
    infoBoxClearance: new google.maps.Size(5, 5),
    closeBoxURL: '',
    isHidden: true,
    pane: "floatPane",
    enableEventPropagation: false,
    contextmenu: true
    };