how can i use the period delimited hierarchy function of the SortMember Path function in CodeBehind??

hey,

i Need to sort a column of my datagrid. To sort the column, i've set the sortmeberpath.

Inside the MSDN decription of the SortMemberPath-Property: http://msdn.microsoft.com/en-us/library/system.windows.controls.datagridcolumn.sortmemberpath(v=vs.110).aspx

stands the Explanation, what a sort member path is a period-delimited hierarchy of property names.

NOw i asked myself how to apply this Feature in codebehind????