private void AddRecalculateCO2eButton(RibbonPanel panel)
{
var pushButton = panel.AddItem(new PushButtonData("recalculateCO2e", "Recalculate CO2e\nfor all elements", AddInPath, "AMEE_in_Revit.Addin.Commands.RecalculateCO2eCommand")) as PushButton;
pushButton.Image = pushButton.LargeImage = new BitmapImage(new Uri(ButtonIconsFolder + @"\calculate.png"));
}