Bug 152430 Key can modify to empty string
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SelectionChoiceHandle.java
* Sets the resource key if label needs localization.
	 * 
	 * @param labelResourceKey
	 *            the resource key to set
	 */
	public void setLabelKey( String labelResourceKey )
	{
		setPropertySilently( SelectionChoice.LABEL_RESOURCE_KEY_MEMBER,
				labelResourceKey );
	}
	/**
	 * Returns the data value for this choice.
	 * 
	 * @return the data value for this choice
	 */
	public String getValue( )
	{
		return getStringProperty( SelectionChoice.VALUE_MEMBER );
	}
	/**
	 * Sets the data value for this choice.
	 * 
	 * @param value
	 *            the value to set
	 */
	public void setValue( String value )
	{
		setPropertySilently( SelectionChoice.VALUE_MEMBER, value );
	}
}