TableWrappedData

An example

    public void createPartControl(Composite parent) {
          toolkit = new FormToolkit(parent.getDisplay());
          form = toolkit.createForm(parent);
          form.setText("Hello, Eclipse Forms(TableWrapLayout)");
          TableWrapLayout layout = new TableWrapLayout();
          layout.numColumns = 3;
          form.getBody().setLayout(layout);
         
          Label label;
          TableWrapData td;
          label = toolkit.createLabel(form.getBody(),
           "Some text to put in the first column", SWT.WRAP);
         
          label = toolkit.createLabel(form.getBody(),
           "Some text to put in the second column and make it a bit "+
           " longer so that we can see what happens with column "+
           " distribution. This text must be the longest so that it can "+
           " get more space allocated to the columns it belongs to.",
           SWT.WRAP);
          td = new TableWrapData();
          td.colspan = 2;
          label.setLayoutData(td);

          label = toolkit.createLabel(form.getBody(),
           "This text will span two rows and should not grow the column.",
           SWT.WRAP);
          td = new TableWrapData();
          td.rowspan = 2;
          label.setLayoutData(td);
         
          label = toolkit.createLabel(form.getBody(),
           "This text goes into column 2 and consumes only one cell",
           SWT.WRAP);
          label.setLayoutData(new TableWrapData(TableWrapData.FILL_GRAB));
         
          label = toolkit.createLabel(form.getBody(),
           "This text goes into column 3 and consumes only one cell too",
           SWT.WRAP);
          label.setLayoutData(new TableWrapData(TableWrapData.FILL));
         
          label = toolkit.createLabel(form.getBody(),
           "This text goes into column 2 and consumes only one cell",
           SWT.WRAP);
          label.setLayoutData(new TableWrapData(TableWrapData.FILL_GRAB));
         
          label = toolkit.createLabel(form.getBody(),
           "This text goes into column 3 and consumes only one cell too",
           SWT.WRAP);
          label.setLayoutData(new TableWrapData(TableWrapData.FILL));
         
          form.getBody().setBackground(form.getBody().getDisplay().
             getSystemColor(SWT.COLOR_WIDGET_BACKGROUND));   
    }

This code is from article corner of eclipse.org. I am not very clear about the option (FILL_GRAB). Maybe someone can tell the effect of this option