gridData.grabExcessHorizontalSpace = true;
    private void addSeparator(Composite parent) {        Label separator = new Label(parent, SWT.SEPARATOR | SWT.HORIZONTAL);        GridData gridData = new GridData();        gridData.horizontalAlignment = GridData.FILL;        //gridData.grabExcessHorizontalSpace = true;        separator.setLayoutData(gridData);    }