getting the column id via context menu javascript

Here is an example of a context menu used for time range selection:

    <DayPilot:DayPilotMenu ID="DayPilotMenuSelection" runat="server" CssClassPrefix="menu_default">
        <DayPilot:MenuItem Action="JavaScript" JavaScript="dpc1.timeRangeSelectedCallBack(e.start, e.end, e.resource); dpc1.clearSelection();"
            Text="Create new event (JavaScript)" />
        <DayPilot:MenuItem Action="PostBack" Command="Insert" Text="Create new event (PostBack)" />
        <DayPilot:MenuItem Action="CallBack" Command="Insert" Text="Create new event (CallBack)" />
        <DayPilot:MenuItem Text="-" ></DayPilot:MenuItem>
        <DayPilot:MenuItem Action="JavaScript" JavaScript="if (!copied) { alert('You need to copy an event first.'); return; } dpc1.commandCallBack('paste', {id:copied, start: e.start});" Text="Paste" />
        <DayPilot:MenuItem Text="-" ></DayPilot:MenuItem>
        <DayPilot:MenuItem Action="JavaScript" JavaScript="alert('Start: ' + e.start.toString() + '\nEnd: ' + e.end.toString() + '\nResource id: ' + e.resource);"
            Text="Show selection details" />
        <DayPilot:MenuItem Action="JavaScript" JavaScript="dpc1.clearSelection();"
            Text="Clean selection" />
    </DayPilot:DayPilotMenu>

You can access the selection properties using e.start, e.end and e.resource.

See also:

http://doc.daypilot.org/calendar/time-range-context-menu/

i have tried e.resource without brackets i get undefined and with the brackets i get nothing populating
i get the date ranges populating and also if i use it over a current entry the current entry id

im getting this java error

SCRIPT438: Object doesn't support property or method 'resource'

when i do a javascript debug

i get stuck on the method below
function onclick()
{
var e = this.parentNode.event || this.parentNode.selection; var command = ''; openPopup(e.start(e), e.end(e), e.resource(e));; return false;
}

its fine i managed to use postscript method e.command to populate the javascript from behind code and use e.resource