How to tell if cancel or screen was pressed when in optiondialog

Hi

I use this small function to present a dialog with a list of options:¨

function showListBox(title, list, callback, callbackCancel) {
    list.push(L('button_cancel'));
    var dialog = Ti.UI.createOptionDialog({
        title: title,
        cancel: list.length-1,
        options: list
    });
    dialog.addEventListener('click', function(e){
        if (e.index === e.source.cancel){
            if(callbackCancel) {
                callbackCancel(-1);
            }
        } else {
            if(callback) {
                callback(e.index);
            }
        }
    });
    dialog.show();
}

I add a cancel option to the list sent to the function and tell the optionDialog that this last element is "cancel". However, I would like to handle pressing "Cancel" and pressing on the screen outside of the dialog differently. With the above code I get the "cancelled" index back if the user presses the screen outside the dialog.

The use case where I want to do this is when using the option dialog to give users functions when selecting a location on a map. If the user clicks on the map to move an annotation I just want the dialog to disappear - but not call the "cancel" function. When the user has dropped the pin again I show the dialog box again.

I am using Studio 3.5.0 (on Mac) and the functionality has been tested on iOS so far (but also needs to work on Android).

Thanks!

/John