2 way databinding

[vbArch]

I have a custom class that implements the idataerrorinfo and ieditableobject interface that I am binding to a form. Each Property raises an event to the UI when it changes and I am binding a Dirty property to the OK buttons enabled property. Everything works great, except. The user must change data in a control and then move off the control for the UI to recognize that the dirty state has changed. What am I missing, when I bind to a dataset this is not a problem.