This video demonstrates the new and improved patient dashboard in OpenMRS which entails dynamic tab loading capabilities. These enhancements were carried out under the Google Summer of Code 2012 program.
Project Description:
https://wiki.openmrs.org/display/projects/Patient+Dashboard+Tabs+Loaded+via+AJAX
Project Documentation and User Manual:
https://wiki.openmrs.org/display/projects/Ajax+Enabled+Dynamic+Patient+Dashboard