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Access the Embedded RadCalendar on the Server
The popup calendar in RadScheduler is actually RadCalendar and is a child control of RadScheduler. The ID of the embedded RadCalendaris "SelectedDateCalendar", so getting a reference to it on the server-side can be done easily in RadScheduler's PreRender event as shown below:
C#
protected void RadScheduler1_PreRender(object sender, EventArgs e)
{
RadCalendar popupCalendar = RadScheduler1.FindControl("SelectedDateCalendar") as RadCalendar;
popupCalendar.ShowOtherMonthsDays = true;
}