Datagrid Row Update problem

I am using WPF toolkit Datagrid. I have a rowvalidationrule defined on this. to trigger this validation rule, on each cell update i have to hit enter button. but i want to check this on each cell update without hitting Enter button. 开发者_Python百科How can i do this. this is a MVVM app. Thanks, Rey

i am using IDataErrorInfo and UpdateSourceTrigger=propertychanged to trigger cell level validation.