I am using DayPilot Calendar 5.9 I use this EventMoveJavaScript="dpc1.eventMoveCallBack(e, newStart, newEnd, oldColumn, newColumn, true)" In the 6th parameter, I put a boolean object. In the codebehind in the event handler, e.data is always null no matter what I put in the 6th parameter in the javascript callback. What am I doing wrong? Thanks!, Ryan