Closed Issue: Multiple PostBack by FilteredTextBox in Gridview templated item [14996]

I have a templateditem in my gridview. The item contains a textbox.

I wanted to filter the textbox soy I placed a FilteredTextBox for the tb. But it generated multiple postbacks on my onTextChanged (3 to be exact)

Is anyone having this same problem??
Comments: This ticket was filed for a pre-15.1 version of AJAX Control Toolkit. If this is still an issue in v15.1 or later, please create a new inquiry.