Datagrid not updating after databind silverlight

For example, you might want to display a list of items, such as monthly credit card bills.To do this, use an The visual feedback indicates the control that contains the error, and displays the error message nearby, as shown in the following illustration.If you have multiple levels of grouping, you can apply different styles to each group level.Styles are applied in the order in which they are defined.

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, you bind it to a collection view that supports these functions.

So, I have this WPF datagrid, and it's quite happy in the way it works. Some background, I'm not doing the base behavior for editing/adding, but rather have a separate control outside the grid which is responsible for that behavior (as it is also the control responsible for adding the initial element).