cellrenderer_value->signal_edited().connect(sigc::mem_fun(*this, &studio::LayerTree::on_edited_value));
cellrenderer_value->property_value()=synfig::ValueBase();
column->add_attribute(cellrenderer_value->property_param_desc(), param_model.param_desc);
cellrenderer_value->signal_edited().connect(sigc::mem_fun(*this, &studio::LayerTree::on_edited_value));
cellrenderer_value->property_value()=synfig::ValueBase();
column->add_attribute(cellrenderer_value->property_param_desc(), param_model.param_desc);