Component c4,
ColumnSpec colSpec) {
FormLayout layout = new FormLayout("", "pref");
for (int i = 0; i < 4; i++) {
layout.appendColumn(colSpec);
layout.appendColumn(FormFactory.RELATED_GAP_COLSPEC);
}
PanelBuilder builder = new PanelBuilder(layout);
builder.setOpaque(false);
CellConstraints cc = new CellConstraints();
builder.add(c1, cc.xy(1, 1));