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Finding SelectedIndex for a Listbox in a DataTemplate?

Posted By:      Posted Date: April 10, 2011    Points: 0   Category :JQuery

In this post -- http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/bf7968d1-352d-439c-8bfe-f19aefd24452 -- I asked about getting to controls that reside in a data template, and was told (quite rightly) that rather than trying to do that, I should be binding control properties to properties in my data.  I have done that, and things are working great.  However, I have one more problem that I haven't been able to find a solution for in various posts.  Among other things in this DataTemplate, I have a textbox where you enter text, a plus button to put data into the listbox, a minus button to take data out of the listbox, and the listbox itself.  This listbox is bound to an observable collection (UsersList), and the textbox is bound to a UsernameEntered property, so when that prop changes, the listbox is populated.  Relevant xaml is:

<DataTemplate DataType="{x:Type local:Users}">
   <TextBox Grid.Row="2" Grid.Column="0" etc. etc Name="tbUsername" Text="{Binding Path=UsernameEntered}"/>
   <Button Grid.Row="1" Grid.Column="1" etc. etc. Name="plusButton" MinWidth="20&quo

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