I'm developing a custom control for my maps, and I would like to add a
simple close button (i.e. X) to make the control invisible (i.e. CSS
display = none). However, I can't seem to get the proper reference to
the control div element to do this -- everything I've tried gives
JavaScript errors.

I know this is sort of a JavaScript question, but I'm assuming someone
has done this before with Google Maps controls.

Here's what I'm trying below (which doesn't work); controlDiv is
declared as a object member elsewhere, but it's not accessible inside
the click handler.

MyControl.prototype.initialize = function( map )
{
        this.controlDiv = document.createElement( "div" );
        ...

        var closeButton = document.createElement( "img" );
        ...

        google.maps.Event.addDomListener( closeButton, "click", function()
                {
                        this.controlDiv.style.display = "none";
                }
        );
        ...
};
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