Unfortunately it does not seem possible to achieve simply from MATLAB. The dendrorgram plot is just like any other MATLAB figures, and functionality of exporting MATLAB figure information to directly support third-party graphical software is not available.
Your best shot is probably to explore any third-party tools or File Exchange submissions which could have such capability. I am not sure what "information" specifically you are looking to export, but the File Exchange submission below may worth taking a look:
