private void registerTreeGridRpc() { registerRpc((NodeCollapseRpc) (rowKey, rowIndex, collapse, userOriginated) -> { T item = getDataCommunicator().getKeyMapper().get(rowKey); if (collapse && getDataCommunicator().isExpanded(item)) { getDataCommunicator().collapse(item, rowIndex); fireCollapseEvent( getDataCommunicator().getKeyMapper().get(rowKey), userOriginated); } else if (!collapse && !getDataCommunicator().isExpanded(item)) { getDataCommunicator().expand(item, rowIndex); fireExpandEvent( getDataCommunicator().getKeyMapper().get(rowKey), userOriginated); } }); registerRpc((FocusParentRpc) (rowKey, cellIndex) -> { Integer parentIndex = getDataCommunicator().getParentIndex( getDataCommunicator().getKeyMapper().get(rowKey)); if (parentIndex != null) { getRpcProxy(FocusRpc.class).focusCell(parentIndex, cellIndex); } }); }