gtk_widget_set_no_show_all (priv->progress_bar, TRUE);
placeholder = gtk_ui_manager_get_widget (parent_priv->ui_manager, "/ToolBar/ProgressBarView");
insert_index = gtk_toolbar_get_item_index(GTK_TOOLBAR (parent_priv->toolbar), GTK_TOOL_ITEM(placeholder));
gtk_widget_set_no_show_all (priv->progress_bar, TRUE);
placeholder = gtk_ui_manager_get_widget (parent_priv->ui_manager, "/ToolBar/ProgressBarView");
insert_index = gtk_toolbar_get_item_index(GTK_TOOLBAR (parent_priv->toolbar), GTK_TOOL_ITEM(placeholder));