Bug 141709 The Interface "IScalarParameterModel" should provide a "TEXT_ID_PROP" member.
In order to provide the "Localization" function in Property Editor of Parameter, it requires to implement a "ScalarParameterI18nPage" Class similar to the Class of "LabelI18nPage", and it consequently needs to "IScalarParameterModel" provide a "TEXT_ID_PROP" member for "ScalarParameterHandle" Class.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ScalarParameterHandle.java
* 
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setValueExpr( String valueExpr ) throws SemanticException
	{
		setStringProperty( ScalarParameter.VALUE_EXPR_PROP, valueExpr );
	}
	/**
	 * Returns an expression on the data row from the dynamic list data set that
	 * returns the prompt for the choice.
	 * 
	 * @return an expression that returns the display value for each row in the
	 *         dynamic list.
	 */
	public String getLabelExpr( )
	{
		return getStringProperty( ScalarParameter.LABEL_EXPR_PROP );
	}
	/**
	 * Sets an expression on the data row from the dynamic list data set that
	 * returns the prompt for the choice.
	 * 
	 * @param labelExpr
	 *            an expression that returns the display value for each row in
	 *            the dynamic list.
	 * 
	 * @throws SemanticException
	 *             if the property is locked.
	 */