Release 10.1A: OpenEdge Development:
Programming Interfaces

> ## Special considerations for extended controls

> The control container normally maintains relationships among controls. However, in Progress, because the control-frame can hold only a single ActiveX control, the extended properties (such as those that manage control position within the control container) can be maintained on the control-frame widget itself. Thus, the control-frame widget attributes manage the relationship between the ActiveX control and the parent frame widget (its effective container) in the user interface. For this same reason, additional extended properties that would otherwise be available on the extended control are found on the control frame widget instead.

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