You got it right, but your attempt to double-check was misleading : )
To select the outline boxes which are returned by the Xpath command, use:
(obj<< XPath("//OutlineBox[text()='Correlations']"))<<select;
Without the additional brackets, you will send the select command to obj.
like in
Data Table( "Height" ) << Clear Select << Select Rows( [4] ) << Delete Rows;