| :: Reference :: Groups ::Column and row groups are used to specifiy that a set of columns or rows 
    will get the same width or height. This is an essential feature 
    to implement symmetric, and more generally, balanced design.ExampleIn the following example it is ensured that columns 2 and 4 
    get the same width, rows 1 and 4 get the same height 
    as well as rows 2 and 3:
FormLayout layout = new FormLayout("p, d, p, d", "p, p, p, p");       
layout.setColumnGroups(new int[][]{ {2, 4} });
layout.setRowGroups   (new int[][]{ {1, 4}, {2, 3} });
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