//This example uses the FloatingObjectSelectionChanged event.
var customFloatingObject = new GC.Spread.Sheets.FloatingObjects.FloatingObject("f1", 10, 10, 60, 64);
var btn = document.createElement('button');
btn.style.width = "60px";
btn.style.height = "30px";
btn.innerText = "button";
customFloatingObject.content(btn);
activeSheet.floatingObjects.add(customFloatingObject);
// Use IE to see the console log text
activeSheet.bind(GC.Spread.Sheets.Events.FloatingObjectSelectionChanged, function (e, info) {
       console.log("sheet name: " + info.sheetName);
});