Hey,
We currently use the property grid with custom data accessors (implementing IDataErrorInfo). It appears your standard editors validate on load, however we have not been able to easily get this functionality working in our custom editors.
What functionality are you using within your editors to get this working?
I don't believe we do too much behind the scenes related to IDataErrorInfo. If the target of a property data accessor is an IDataErrorInfo, it will publish IDataErrorInfo up into the property editor UI by having PropertyGridDataAccessorItem also implement IDataErrorInfo and "wrap" the IDataErrorInfo properties returned by the target.
Then many of our property editors have the Validation.ErrorTemplate="{StaticResource PropertyGridTextBoxErrorTemplate}" set within the DataTemplate somewhere. The Data Validation QuickStart also shows how to make a custom error validation template.
Everything else that is going on related to IDataErrorInfo is pretty much native WPF code.
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