Java EE (Java Enterprise Edition) General Discussion

Iam new to JSF..
iam using JSF and Tiles.In the body tile, iam displaying a form with submit and cancel buttons inside panelGrid with 3 columns ( one for field labels, one for input fields, another to display validation errors next to the fields). I kept validations for the input fields. When the validations errors are displayed, the gird is moving left. i want to fix the size of the columns. if the error message is displayed in last column, it should not affect the grid. How to fix the column width?? After loading of the form first time( with out validation errors displayed) it is looking fine but after displaying validation error the grid alignment is disturbed. There is nothing in 3rd column if validations are not displayed. the width is minimum. How to fix the column width for columns without any content initially?
If there is any examples for alignment inside panelGrid ,provide me pls
Thanks