Command Event for Dynamicly created button not firing

I have form that is utilizing AJAX where the user enters a value into a textbox which then searches the DB for matching and if there are more than one it display's a list of them each with a display button.  The problem is the display button's event is never fired?
Page Loads - Nothing happens here.

User Enters Value in Text Box and clicks the find button. This searches the DB and Returns any Records Found
If More than One Is returned a Table is Displayed with all the results and each result has a Display Button.
Problem is Here the Display Button's Command event Dosn't Fire...
 
foreach (DataRow dr in ds.Tables[0].Rows)
                {
                    tr = new TableRow();

         ...