button:checked {
	color: #ff0000;
	background-color: #0000ff;
}

public class Toggle {

    private final GridDataFactory aFillGdf = GridDataFactory.createFrom(new GridData(SWT.FILL, SWT.FILL, true, false));

    public void doStuff() {

        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        shell.setSize(600, 400);

        Button button = WidgetFactory.button(SWT.TOGGLE).text("sometext").layoutData(aFillGdf.create()).create(shell);
//        button.setBackground(SWTResourceManager.getColor(SWT.COLOR_WIDGET_BACKGROUND));

        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }

    public static void main(String[] args) {
        Toggle toggle = new Toggle();
        toggle.doStuff();
    }
}