Getting OnBeforeEventRender to fire for Month

The event handler is invoked correctly but this call will not do anything, Response.Write() is not allowed there. You can check it by modifying the event:

e.InnerHTML = "test";
e.BackgroundColor = "red";

e.e.BackgroundColor is not taking affect. My code is:

<DayPilot:DayPilotMonth
ID="dpMonth"
runat="server"
DataEndField="end"
DataStartField="start"
DataTextField="name"
DataValueField="id"
DataTagFields="name, id"
EventClickHandling="ContextMenu"
EventClickJavaScript="alert(e.text());"
ClientObjectName="dpm"
BubbleID="DayPilotBubble1"
ShowToolTip="false"
EventStartTime="false"
EventEndTime="false"
CssClassPrefix="month_blue"
CssOnly="true"
HeaderHeight="25"
EventHeight="25"
TimeRangeDoubleClickHandling="JavaScript"
TimeRangeDoubleClickJavaScript="alert('doubleclick:' + start)"
OnBeforeEventRender="DayPilotMonth1_BeforeEventRender">

protected void DayPilotMonth1_BeforeEventRender(object sender, DayPilot.Web.Ui.Events.Month.BeforeEventRenderEventArgs e)
{
e.BackgroundColor = "black";
}