I'm not sure if the problem is with my code or with JRE 1.7 plugin for Safari with Mac OS , as custom popup doesn't seems to be working in the above mentioned combination
But when we try to make a server call to populate data in a custom popup in the Custom combo box extended by JComboBox it flashes the popup for some micro seconds and then disappears .
The same code works fine JRE 1.6 plugin for Safari with Mac OS and also JRE 1.7 , JRE 1.6 plugin for IE with Windows OS .