When I select a date in the calendar, the date appears in the TextBox, but the OnTextChanged event for the Textbox never fires. If I manually change the date in the TextBox, however, the OnTextChanged event DOES fire.
I've got AutoPostBack="True" set on both TextBoxes and both DropDownLists. Also, I have set autocomplete="off" in the master page's <form>. I have also placed an OnBlur call in the TextBox, but this event only fires when I manually change the date as well.