Hi. I have created two classes that extend JPanel. These JPanels are placed on a JTabbedPane. One of these classes represents a 'Project Maintenance' tab. The other represents an 'Order Maintenance' tab. These two classes each have a combo box on them that contains project ID's. I want to be able to re-populate the data in this combo box on the order maintenance tab whenever a user has pressed the save button on the project maintenance tab, and there were no errors. The main class that creates the JTabbedPane, also creates the ProjectMaintenance class and the OrderMaintenance class. I thought I could just pass OrderMaintenace into ProjectMaintenance, and access it that way, but I get a runtime error when I do this. (ClassNotFoundException). In the code, OrderMaintenance is created before ProjectMaintenance so I thought it should recognize it. However, if I switch the order that these two classes are added to the JTabbedPane it works. But I don't want OrderMaintenance before ProjectMaintenance on my TabbedPane. Does anyone know of a way I can do this? Here is the code for my main class..