hmm i think what you want is already included. if i understood your wish the right way, you just have to click on (i think in english) the "fields"-button at the bottom of the grid. there (choose the first of the 3 menu-items - should be something like field-manager) you can add or delete column headings(fields) displayed in the grid. if you click on the top of the grid direct on the column-name then the grid is sorted fitting to the selected column. if you want to change the order of the fields, just drag it by holding mouse-button to where you want it ...
is this what you where lookin' for or was i mistaken ?