Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportDesignHandle.java
* 
	 * <ul>
	 * <li><code>DesignChoiceConstants.REPORT_LAYOUT_PREFERENCE_FIXED_LAYOUT</code>
	 * <li><code>DesignChoiceConstants.REPORT_LAYOUT_PREFERENCE_AUTO_LAYOUT</code>
	 * </ul>
	 * 
	 * @return
	 */
	public String getLayoutPreference( )
	{
		return getStringProperty( LAYOUT_PREFERENCE_PROP );
	}
	/**
	 * Sets the layout preference of this report design. The input layout can be
	 * one of the following:
	 * <ul>
	 * <li><code>DesignChoiceConstants.REPORT_LAYOUT_PREFERENCE_FIXED_LAYOUT</code>
	 * <li><code>DesignChoiceConstants.REPORT_LAYOUT_PREFERENCE_AUTO_LAYOUT</code>
	 * </ul>
	 * 
	 * @param layout
	 *            the layout to set
	 * @throws SemanticException
	 *             if value is invalid
	 */
	public void setLayoutPreference( String layout ) throws SemanticException
	{
		setStringProperty( LAYOUT_PREFERENCE_PROP, layout );
	}
}