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Editorial Team
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Asked: 2026-05-14T02:06:37+00:00

Is it possible to determine which property of an ActiveX control is the default

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Is it possible to determine which property of an ActiveX control is the default property? For example, what is the default property of the VB6 control CommandButton and how would I found out any other controls default!

/EDIT: Without having source to the object itself

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  1. Editorial Team

    Use OLE/Com Object Viewer, which is distributed with Microsoft Visual Studio.

    Go to type libraries and find the library the control is housed in, for example CommandButton is stored in Microsoft Forms 2.0 Object Library. Right click the library and select view. Find the coclass representing the control and select it:

    alt text

    As can be seen, the default interface for CommandButton is ICommandButton, when you inspect ICommandButton look for a property that has a dispid of 0. The IDL for the dispid 0 property of CommandButton is:

    [id(00000000), propput, bindable, displaybind, hidden, helpcontext(0x001e8d04)]
void Value([in] VARIANT_BOOL rhs);
[id(00000000), propget, bindable, displaybind, hidden, helpcontext(0x001e8d04)]
VARIANT_BOOL Value();

    Showing you the default property.

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