Hi Steve,
I am assuming you are talking about exposing the control properties in the
InfoPath designer. If that's not correct let me know. To do so you have to
implement a property page for your control (see IPropertyPage and
IPropertyPageImpl on MSDN). InfoPath will show these pages (you can have
more than one) as a tab when you look at the control properties in the
designer.
Hope this helps.
Frank

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>I am tyring to create the first of several custom controls I need for my
> Infopath 2007 forms. I have a Masked edit control created in VS 2005 and
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> question then please let me know, other wise thanks in advance for your
> time.