It seems to be a custom-built object - that's why TestComplete cannot spy on its elements. But you can probably get data from this object using its internal properties and methods. In the Object Spy, look under the .NET category for properties/methods named Items, Nodes, Data or similar. Or ask the application developers which properties/methods to use to access the data.
You can also try enabling MSAA or UI Automation identification for this object in your project properties; maybe this will expose some extra UI objects. TestComplete also has OCR for reading text from the images.