How to display reply in flex data grid?

Hello All,
Frompast couple of months i am working on a Flex Application which used MySQL databse and PHP as server side language. In this application user can login and they can post their comments which will be displayed in a datagrid. This will have a reply button where other users can send their reply. My problem is how i will be displying the reply of a msg in a datagrid. Here is the screenshot of my datagrid
I thought of 2 options:
1. Displaying the reply in the datagrid and disaply in the same row: i don know how we can do this.
2. Store all the replies in data base and display in toher panel though a button. From flex side it is easy to do but i don know how i can store them in database.
Please let me know if you have any ideas/tutorials on this

This is only in theory, haven't actually checked it but I think it could work
If each one of those posts is done by an itemrender, your renderer can have 2 states stateone and statetwo for example.
The reply state (statetwo) being bigger and containing space for the reply post.
Store your replies in the database and have another boolean column ( Tinyint(1) or something) in your MySql db indicating that a particular post has a reply . When you pull your data from the database and put in in an arraycollection check this column for each post and use it to set the state of the itemrenderer.
That way posts with no reply with be state one, and posts with replies will be state 2 and you can populate the reply field with data from the object in your arraycollection.
I suppose it all does depend on how you get your data from MySQL and how you store it in Flex but I think states is a way you could accomplish things like this.

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