'checked' property in Microsoft datetimepicker control

I'm trying to include the Microsoft datetimepicker control into a Visual FoxPro form.
I need to be able to include a checkbox into the control, for those occasions when there won't be a date.

I can get the ActiveX control onto the form.

When I come to the properties list, I have an entry for the .CHECKBOX property, which is set to .F. by default. But I can't change this on the PEM list to .T. - am I doing something wrong here?

However, I have found that, within the .INIT() method I can do
    .CHECKBOX = .T.
and the checkbox will appear.

But the most annoying thing is when I'm storing the contents from the control. I'd like to be able to read the state of the checkbox, which I think I ought to be able to do using the .CHECKED property. But (a) that doesn't appear on the PEM list and (b) if I try referring to it programmatically, then I get an error messsage that indicates that .CHECKED doesn't exist.

Any suggestions?
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IainMacbAsked:
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HooKooDooKuCommented:
The Microsoft Date/Time picker for C++ in Visual Studio 2010 has no 'Checked' property.  So perhaps that isn't really a property.

But then a checkbox is a pretty simple strait forward control.  What about simply adding your own check box as a 2nd control.  Then you could modify the datetime picker based on the status of the checkbox and you wouldn't have any limits placed on you by the datetime picker.
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IainMacbAuthor Commented:
The perils of Google - I'd ended up with Microsoft's description of the DateTimePicker, at http://http://msdn.microsoft.com/en-us/library/system.windows.forms.datetimepicker.checked%28v=vs.80%29.aspx, which does have a .CHECKED property.

The idea of having a separate checkbox was one that had occurred to me, and which I'd started doing before I got waylaid by the wrong documentation!
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