Catel.Windows.DataWindow.AddCustomButton C# (CSharp) Метод

        protected void AddCustomButton(DataWindowButton dataWindowButton)
        {
            if (InternalGrid != null)
            {
                throw new InvalidOperationException(Exceptions.DataWindowButtonCanOnlyBeAddedWhenWindowIsNotLoaded);
            }

            _buttons.Add(dataWindowButton);
        }