I am doing something like this example now.
I have a custom property editor with my own validataion error template that has a tooltip to show the error text on the value template.
I have a class that uses IDataErrorInfo, and for the property field that is a collection, I collect and show the validation for the first child that has an error.
Each child is an instance of a class that uses IDataInfoErro and this class also is defined to use my custom error property editor, but I dont know how to trigger the validation on the child in the collection.
I would like the child's value field to show the "red outlined" box and tooltip if there is an error.
[Modified 8 years ago]