This enhancement has been incorporated in Release 2006a (R2006a). For previous product releases, read below for any possible workarounds:
Information regarding upgrading your Simulink model from a previous version can be found in the below URL.
https://www.mathworks.com/help/simulink/model-upgrades.html
This document describes the issues involved with upgrading a Simulink model to the current version from previous versions. Problems can arise due to new blocks or libraries, the support of new signal types (frame-based and matrix signals), or changes in the name or functionality of a block. Failure to update your model can lead to problems, such as segmentation violations or seemingly inconsistent results. These issues are not limited to Simulink alone. Many other blocksets have similar upgrading issues. To avoid these problems, Simulink and several other blocksets have built-in tools that aid in updating your model. It is important to update every block in your model (from Simulink and all other blocksets). This document explains how to update your model.
