Create a GH_ButtonObject() in C#, its Attributes.Pivot not working!

Hello, I am trying to use C# to create a ButtonObject(), but its attributes.pivot seems not working! I also checked the Attributes.Bounds, same. This happens to BooleanToggle() as well, but there is no problem with ValueList().

Does anyone know about this? Thanks!

Here is the code:

Grasshopper.Kernel.Special.GH_ButtonObject flyButton = new Grasshopper.Kernel.Special.GH_ButtonObject();
flyButton.CreateAttributes();

float xCoord = Component.Attributes.Pivot.X - 200;
float yCoord = Component.Attributes.Pivot.Y;
PointF cornerPt = new PointF(xCoord, yCoord);
SizeF sizeDim = new SizeF(104, 22);
RectangleF loctSize = new RectangleF(cornerPt, sizeDim);

flyButton.Attributes.Pivot = cornerPt;
flyButton.Attributes.Bounds = loctSize;

GrasshopperDocument.AddObject(flyButton, false);
this.Component.Params.Input[1].AddSource(flyButton);
this.Component.Params.Input[1].CollectData();