Bug 210496 Add hasStyle property in reportItemModel extension point
When chart gets reportItem's properties by extending ReportItem, style properties are null. Hence, model needs to add hasStyle property in reportItemModel extension point
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementDefn.java
*/
	public List getExpressions( )
	{
		return getPropertyListWithType( getProperties( ),
				IPropertyType.EXPRESSION_TYPE );
	}
	/**
	 * Returns the expression property definition list of this element
	 * definition. Each one is the instance of <code>PropertyDefn</code>.
	 * 
	 * @return the expression property definition list.
	 */
	public List getLocalExpressions( )
	{
		return getPropertyListWithType( getLocalProperties( ),
				IPropertyType.EXPRESSION_TYPE );
	}
	/**
	 * Returns the property definition list each of which is defined in given
	 * property definition list with the given type.
	 * 
	 * @param propList
	 *            the property definition to search
	 * @param type
	 *            property type code, It's the constant defined in
	 *            <code>PropertyType</code>.
	 * @return the property definition list
	 */
	private List getPropertyListWithType( List propList, int type )
	{