Change margins (left/top) of all components in a lazreport file

[RobyWan]

Hi everybody!
I make a report with lazreport, and it's ok. Now I need to change on the fly all margins (left and top value) to center fine the cells of my paper on which I go to print (for example different printers have different margins and my work go out the cells). After all I may decide if save the changes on the lfr file or not.
I'm going crazy because I'm not able to access the components...  .
Can somebody help me, please?

Thanks in advance and Merry Xmas to you!