Vista - DataBinding to indexer

Hi all,

I'm searching for a solution to bind a UIElement to a custom Data object
with dynamic number of properties.

The first idea was to wrap all values-properties, those I want to bind, in a
collection ( Dictionary<Attribute, string> _properties )
The access to values would be provided through an indexer:

public Attribute this[string propertyName]
{
get { return _properties[propertyName];}
set ....
}

to bind the indexer to UI property name schould be something like that:
for example in code:
Binding b1 = new Binding ("["+0+"]");
Binding b1 = new Binding ("["+1+"]"); and so on..

or in XAML: Text="{Binding Path=[someName]}"

so that works really good for geting data to ui. But what i'm missing here
is notification of one property's changes. If my custom class would implement
INotifyPropertyChange, I could fire for example PropertyChange("[0]"), but
this doesn't work. If I fire PropertyChange(""); with empty string as
parameter, then I can get updates, but each item in the property list will be
called. Thats not prety nice. I'm confused.

Any simple ideas, how to notify the ui about property chnage of an
individual property from the list???

Thanks a lot