Issue with IDataErrorInfo with text box in Expander

Posted by Amit on Stack Overflow See other posts from Stack Overflow or by Amit
Published on 2010-05-18T13:36:35Z Indexed on 2010/05/18 13:40 UTC
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I have one expander and which contain text box, text is validating through IDataErrorInfo, it is working fine when i enter wrong information, it popup with red rectangle.

but issue arises when i tried to collase the expander, and red rectangle is still there. it stayed on Expander

so please provide soem good solution....

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