You could implement a DataTemplateSelector like described here.
I use it and it works pretty well.
EDIT:
If you need to update the DataTemplate when the property changes, you should subscribe to the PropertyChanged event of the data object in the TemplateSelector and execute the SelectTemplate method again.
Here is the code sample:
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
City itemAux = item as City;
// Subscribe to the PropertyChanged event
itemAux.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler(itemAux_PropertyChanged);
return GetTemplate(itemAux, container);
}
private DataTemplate GetTemplate(City itemAux, DependencyObject container)
{
if (itemAux != null)
{
if (itemAux.Country == "Brazil")
return BrazilTemplate;
if (itemAux.Country == "USA")
return UsaTemplate;
if (itemAux.Country == "England")
return EnglandTemplate;
}
return base.SelectTemplate(itemAux, container);
}
void itemAux_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
// A property has changed, we need to reevaluate the template
this.ContentTemplate = GetTemplate(sender as City, this);
}