public void AddNewSequenceViewer(Schedule _schedule)
{
SequenceCounter++;
SequenceCtrl seqCtrl = new SequenceCtrl(_schedule, true);
SequenceLoader.Controls.Add(new SequenceItem(seqCtrl, SequenceCounter));
AppHistory his = new AppHistory
{
SysActionCode = (int)(SysActionCode.VIEW_SEQUENCE),
Remark = $"PO:{(_schedule as Schedule).PoNumber}",
};
SysHistoryQuery.AddNewAppHistory(his);
}