| Features and Techniques > Using True DataControl in Different Containers > Master Control Cannot Be Chosen From Combo Box in VC++ |
Setting up master-detail relationship in VC++ container at design time, all combo boxes that are supposed to show possible Master controls, are empty. You have to type the master's name (the value of its NameSubstitute property) manually. For the same reason, True DataControl Check facility does not detect "Unknown variable" errors in expressions in VC++ container, since expressions such as "TData1.AField" make use of other TData control's names, which are inaccessible in VC++.