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<h1>:: Reference :: Groups ::</h1>
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.
<h2>Example</h2>
In 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:
<pre>
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} });
</pre>
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