That depends highly on how, where and when the combobox's gets it's data as well as what the combobox actually is. By default, I would say you should be able to use GetNAProperty to get either the cell's or the columns ValueList property, and look at it's ValueListItems. But it is also quite possible that the combobox is a customized editor that doesn't follow that methodology or place of storage for it's data, or that it only populates the combobox on dropdown, and the valuelists are empty prior to that. For the later you can activate the cell, then PerformAction gridEnterEditModeAndDropdown, then try to get the value of the valuelists. If none of those work, I would suggest contacting your developer and learning more about this particular instance of combobox itself.

As to QTP getting ahold of the specific combobox, in most scenarios the combobox is an editor component and not really a control. In which case QTP has no knowledge of it, as it only interacts with objects that inherit form System.Windows.Forms.Control.

   If for some reason that is not a viable option for you, there are other methods. Albeit they will require a greater amount of understanding of code. You could use .NET Reflector, have it open your application, then find the data type that you are looking for.

According to your previous entry in the forums, you would need to expand the references of your application, right click on the reference to Framework, and select Go To Assembly. Find that assembly, which hopefully should be either in the directory of your application or it's bin directory. If you find that assembly, then you can search for it via F3 or View-> Search to search for "Summit.Framework.View.DDItem", double click it in the search window to highlight it in the main window. Finally right click it and select dissemble. It should open a Disassembler window.

 Use the information that you garner from that to access the data via GetNAProperty. Note that GetNAProperty returns allows you to dig down through public properties. It will only return values of properties for simple datatypes such as string, int, double, datetime, etc.

 As I stated this is a much more advanced method of trying to learn about a particular object, and is why we created GetNAProperties, but as this is not a window open to you, due to versioning restrictions, and if the developer is not available to you, it is at least an additional option.