lockedColumnCount in spark datagrid

I hava an application that is in flex 3 and we are migrating it to Flex 4.5, I have a class which extends the mxDataGrid, and it's using the propery lockedColumnCount which doesn't exist in spark datagrid. Isn't there a property in 开发者_开发百科spark datagrid a property that is equivalent to the property lockedColumnCount?

The spark data grid does not support locked rows and columns. See this