Bug 135790 ClassCastException in RowData.
ClassCastException is thrown in RowData line 81(IBaseExpression expr = ( IBaseExpression ) valueExpressions.get( index - 1 );).
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
{
			return IStyle.CSS_ALWAYS_VALUE;
		}
		if ( DesignChoiceConstants.PAGE_BREAK_BEFORE_AUTO.equals( pageBreak ) )
		{
			return IStyle.CSS_AUTO_VALUE;
		}
		if ( DesignChoiceConstants.PAGE_BREAK_BEFORE_AVOID.equals( pageBreak ) )
		{
			return IStyle.CSS_AVOID_VALUE;
		}
		return IStyle.CSS_AUTO_VALUE;
	}
	protected StyleDeclaration createPrivateStyle( ReportElementHandle handle,
			boolean isContainer )
	{
		
		StyleDeclaration style = new StyleDeclaration( cssEngine );
		style.setBackgroundColor( getElementProperty( handle,
				Style.BACKGROUND_COLOR_PROP, true ) );
		style.setBackgroundImage( getElementProperty( handle,
				Style.BACKGROUND_IMAGE_PROP ) );
		style.setBackgroundPositionX( getElementProperty( handle,
				Style.BACKGROUND_POSITION_X_PROP ) );
		style.setBackgroundPositionY( getElementProperty( handle,
				Style.BACKGROUND_POSITION_Y_PROP ) );
		style.setBackgroundRepeat( getElementProperty( handle,
				Style.BACKGROUND_REPEAT_PROP ) );
		
		style