Thank you for your interest in Syncfusion products.
If you want to customize the Alert window of the schedule control, you can use the ‘scheduleControl1.AlertWindow’ property. AlertForm has one internal grid which can also be accessed. Here, I have customized the AlertWindow through VisibleChangedevent.
//Invoke the event to customize the alert window while showing.
this.scheduleControl1.AlertWindow.VisibleChanged += AlertWindow_VisibleChanged;
this.scheduleControl1.EnableAlerts = true;
void AlertWindow_VisibleChanged(object sender, EventArgs e)
AlertForm form = sender as AlertForm;
if(form !=null && form.Visible)
form.StartPosition = FormStartPosition.CenterParent;
form.buttonDismiss.BackColor = Color.LightPink;
//form.Grid is the internal grid -> GridControl
form.Grid.QueryCellInfo += Grid_QueryCellInfo;
Please let me know if you have any concerns.