g_signal_connect (de->data_store->dict, "backend-changed", G_CALLBACK (new_variables_callback), de);
g_signal_connect (de->data_store->dict, "variable-inserted", G_CALLBACK (insert_variable_callback), de);
g_signal_connect (de->data_store->dict, "variable-deleted", G_CALLBACK (delete_variable_callback), de);
g_signal_connect (de->data_store->dict, "backend-changed", G_CALLBACK (new_variables_callback), de);
g_signal_connect (de->data_store->dict, "variable-inserted", G_CALLBACK (insert_variable_callback), de);
g_signal_connect (de->data_store->dict, "variable-deleted", G_CALLBACK (delete_variable_callback), de);