public override void Execute(object parameter)
        {
            var classBrowser = SD.GetService <IClassBrowser>();

            if (classBrowser != null)
            {
                IAssemblyModel assemblyModel = (IAssemblyModel)parameter;
                if (assemblyModel.IsUnpinned())
                {
                    classBrowser.UnpinnedAssemblies.Assemblies.Remove(assemblyModel);
                }
                else
                {
                    classBrowser.MainAssemblyList.Assemblies.Remove(assemblyModel);
                }
            }
        }