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https://issues.apache.org/jira/browse/TAP5-726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788295#action_12788295
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Denis Stepanov commented on TAP5-726:
-------------------------------------

I know, you can close it if you want, in all cases we are using our own 
GridSource and BeanModel

> Grid should determine the class row type from a field when there is no 
> BeanModel and GridDataSource
> ---------------------------------------------------------------------------------------------------
>
>                 Key: TAP5-726
>                 URL: https://issues.apache.org/jira/browse/TAP5-726
>             Project: Tapestry 5
>          Issue Type: Bug
>          Components: tapestry-core
>    Affects Versions: 5.1.0.5
>            Reporter: Denis Stepanov
>            Priority: Minor
>
> CollectionGridDataSource uses first collection item to determine the class 
> type, but in situation when collection contains different hierarchy 
> implementation there is a ClassCastException

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