Question

Error message: The type ‘GoogleMapProject_Behaviors:ZoomBehavior’ was not found. Verify that you are not missing an assembly reference and that all reference assemblies have been built.

Here is the code:

<i:Interaction.Behaviors>
    <GoogleMapProject_Behaviors:ZoomBehavior/>
    <GoogleMapProject_Behaviors:PanBehavior 
        RightHandPosition="{Binding RightHandPosition, Mode=TwoWay}" 
        LeftHandPosition="{Binding LeftHandPosition, Mode=TwoWay}"
        IsPanning="{Binding IsPanning, Mode=TwoWay}">
        </GoogleMapProject_Behaviors:PanBehavior> 
</i:Interaction.Behaviors>   

Answer 1

This means that your namespace, which is mapped in your XAML as GoogleMapProject_Behaviors does not contain a class ZoomBehavior.

• Check the Namespace mapping (at the top of your XAML file): Does
  GoogleMapProject_Behaviors refer to the correct namespace?
• Next, check your class ZoomBehavior: Is the namespace defined
  correspondingly, Is the class Public, does it have a default
  constructor?

The fact that VS complains about the class indicates that the namespace can be resolved, so that should do it.