Julio,
>When the user clicks the header of any column, the xbrowse should open a get at footer in the same, to perform an incremental search with that column
To do it like that is going to very complex. It will require subclassing the browse and making lots of changes.
I suggest putting a buttonbar at the top of the window and putting the GET inside the buttonbar. Searches are almost always at the top of the screen, and this will not require any changes to the browse.
Regards,
James