Binding doesn't work in MVVM in WP8 - windows-phone-8

Question

I am new in the development of WP8. I have been following a online course for a couple of weeks and the second task of the course was to develop a app to show the weather, some news and photos related to the city.
So far, I have develop the app following the MVVM pattern using the Panorama control as the conteiner for the differents contents I need to show.
To no longer this, the problem I facing is at the moment to display the xml data that is retrieve from the webservices.
The XAML is:
<phone:panorama x:Name="myPanorama"
DataContext = {Binding Source="WeatherViewModel"}>
<PanoramaItem header="MyWeather">
<Textblock x:name="txtCity"
Text = {Binding Weather.City}
</Textblock>
</PanoramaItem>
<panoramaItem header="Config">
<Text x:Name="txtGetCity"/>
<Button x:Name="btnGetCity"
Command={Binding GetWeatherCommand}/>
</panoramaItem>
</phone:panorama>
My ViewModel:
public class WeaterViewModel : NotificationEnableObject
{
private Weather _currentWeather;
public Weather GetCurrentWeather
{
get
{
if (_currentWeather == null)
_currentWeather = new Weather();
return _currentWeather;
}
set { _currentWeather = value;
OnPropertyChanged("GetCurrentWeather");
}
}
//Constructor ServiceModel serviceModel = new ServiceModel();
public WeatherViewModel()
{
serviceModel.GetWeatherCompleted += (s, a) =>
{
_currentWeather = new Clima();
_currentWeather.City= a.Results[0].City;
_currentWeather.tempC = a.Results[0].tempC;
};
getWeatherCommand = new ActionCommand(null);
}
ActionCommand getWeatherCommand; // ActionCommand derivied from ICommand
public ActionCommand GetWeatherCommand
{
get
{
if (getWeatherCommand!= null)
{
getWeatherCommand = new ActionCommand(() =>
{
//Call the Service who retrieved the data
});
}
return getWeatherCommand;
}
}
}
The Weather specified is a public class which contain the City property. I have tried using an IObservableCollention as well howerver, the result is the same :-(
As you can see in the panorama control I have 2 sections. The one where I write the city I wanna see and the section where I show the information I get from the web services.
Any clue, or help would be very appreciate
Regards!

Answer 1

Ok, I think that is an easy fix.
You're setting GetCurrentWeather this way:
_currentWeather = new Clima();
_currentWeather.City= a.Results[0].City;
_currentWeather.tempC = a.Results[0].tempC;
This is not firing the PropertyChanged event. Change it to:
GetCurrentWeather= new Clima();
GetCurrentWeather.City= a.Results[0].City;
GetCurrentWeather.tempC = a.Results[0].tempC;
and you should be fine.