update header method to use same scope as Column#header
update header method to use same scope as Column#header
artofhuman/datagrid,sadaf2605/datagrid,artofhuman/datagrid,reenhanced/datagrid,11factory/datagrid,reenhanced/datagrid,jeanlinux/datagrid,jeanlinux/datagrid,bogdan/datagrid,sadaf2605/datagrid,bogdan/datagrid