public void OnActivate(Excel.Workbook wb)
{
ProcessCleanQueue();
var pane = Panes.GetOrAdd(wb.Name, _ => CreatePane(wb));
var handler = pane.Control.CurrentHandler ?? new WorkbookHandler(wb);
// var handler = Handlers.GetOrAdd(wb, x => new WorkbookHandler(x));
// タブの同期
handler.SyncWorksheets();
pane.Control.AssignWorkbookHandler(handler);
RibbonMenu?.InvalidatePanesVisibility();
}