Allow the RadDateTimePicker editor of RadGridView to allow replacement of the months' popup. Resolution: This behavior can be achieved when set the HeaderNavigationMode property to Zoom of RadCalendar. The feature is introduced in Q2 2014. For example: void radGridView1_CellEditorInitialized(object sender, Telerik.WinControls.UI.GridViewCellEventArgs e) { RadDateTimeEditor dtEditor = e.ActiveEditor as RadDateTimeEditor; if (dtEditor != null) { RadDateTimeEditorElement element = (RadDateTimeEditorElement)dtEditor.EditorElement; element.Calendar.HeaderNavigationMode = HeaderNavigationMode.Zoom; } }