_flattenButton.setSelection(true);
GridData flattenData = new GridData(GridData.FILL_HORIZONTAL);
flattenData.horizontalSpan = 2;
_flattenButton.setLayoutData(flattenData);
_joinsTableEditor = new JoinsTableEditor(_joinsFields, SWT.NONE);
GridData joinsGridData = new GridData(GridData.FILL_HORIZONTAL);
joinsGridData.horizontalSpan = 2;
// joinsGridData.verticalIndent = 15;
_joinsTableEditor.setLayoutData(joinsGridData);