//This example sets the position of caption.
//create config
leftButtonConfig1 = {
    caption: "left",
    enabled: true,
    position: GC.Spread.Sheets.ButtonPosition.right,
    captionAlign:GC.Spread.Sheets.CaptionAlignment.right,
};
rightButtonConfig1 = {
    caption: "left",
    enabled: true,
    position: GC.Spread.Sheets.ButtonPosition.left,
    captionAlign:GC.Spread.Sheets.CaptionAlignment.left,
};
//create style
var style = new GC.Spread.Sheets.Style();
style.cellButtons=[
     leftButtonConfig1,
     rightButtonConfig1
];
sheet.setStyle(0, 0, style);