To be able to sort a single column in a 4D View you need to:
- install the pv On Clicked event
This is done by executing the following statement:
PV ON EVENT (area;pv on clicked;"HeaderSortMethod")

- place the following code in the method called by the pv On Clicked event:

 `HeaderSortMethod method
C_BOOLEAN($0)
C_LONGINT($1;$2;$3;$4;$5;$6)

If ($5=0) `If the click takes place on a header
    $0:=True `Blocks the event
    PV SORT ONE (field3;$4;1;$4;25;1;$4;0) `Ascending sort of the selected column
End if