Most likely, the controls with the "tbEdit" WndClass are custom controls, not standard Win32 controls, and TestComplete does not provide special support for these controls. Try mapping this control as a standard Win32 Edit box control and working with it like with a standard Edit box. Please see the "Object Mapping" help topic to learn how to do this.
If this suggestion does not help, try compiling your application as Open with debug information and working with the problematic controls via their native properties and methods. Please see the "Open Applications" and "Debug Info Agent" help topics for more information.
If you fail to find the needed native methods and properties, please provide us with a sample application containing the problematic controls (compile your sample application as Open with debug information). We will try to find a way you can work with the control. Zip the sample application and send us the file via our Contact Support Form: http://www.automatedqa.com/support/message.asp