flex datagrid validation

I have a flex datagrid in a tabnavigator. Datagrid has 7 columns with dropdown in 5 columns. the defaults for dropdown is empty. while validating the row , when  nothing is selected in dropdown the cell border  should turn red and should display tooltip message . I am toally new
to flex and your help is really appreciated

Thanks
rss29
rss29Asked:
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vindys80Commented:
Hi,

You can check this sample.

http://www.adobe.ca/livedocs/flex/201/html/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Book_Parts&file=celleditor_073_17.html


This sample shows how to use phoneNumberValidator. Instead of that you can use StringValidator
http://www.adobe.com/livedocs/flex/2/langref/mx/validators/StringValidator.html

Thanks,
Vindys
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