instance->synfigapp::Instance::signal_filename_changed().connect(sigc::mem_fun(*this,&Widget_CompSelect::refresh));
instance->synfigapp::Instance::signal_filename_changed().connect(
sigc::bind<etl::loose_handle<studio::Instance> >(
instance->synfigapp::Instance::signal_filename_changed().connect(sigc::mem_fun(*this,&Widget_CompSelect::refresh));
instance->synfigapp::Instance::signal_filename_changed().connect(
sigc::bind<etl::loose_handle<studio::Instance> >(