+ GtkWidget* align = gtk_alignment_new(0.5, 0.5, 0, 0);
+ gtk_widget_show(align);
+ gtk_container_add(GTK_CONTAINER(align), child->m_widget);
+ GtkToolItem* item = gtk_tool_item_new();
+ gtk_container_add(GTK_CONTAINER(item), align);
+ // position will be corrected in DoInsertTool if necessary
+ gtk_toolbar_insert(GTK_TOOLBAR(GTK_BIN(m_widget)->child), item, -1);