Has there been any resolution to issue of combobox not realizing it is loaded when using the callback panel to load?  How does one tell the combobox  it is loaded when I use the callback panel to execute the load?

 I'd also be interested to hear this as I think I may have the same issue, the boxes display the first item of data, however you can not click them to drop down and allow selection when they are in a callback panel.

Anyone else having this issue?

I had that problem, and I made some simple ObjectDataSources and made them bound. For the ObjectDataSources I made a simple provider that returns ILists of the items in the codebehind. It's probably not an optimal solution, but it works.