New Post: How to subscribe for ViewModel events whilst using DesignTimeBinding?

I have set up the binding at the design time. See the code below:

<Window x:Class="Microtech.TPM.Views.DestinationChoiceView"       
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:cal="clr-namespace:Caliburn.Micro;assembly=Caliburn.Micro"
        xmlns:vmns="clr-namespace:Microtech.TPM.ViewModels"
        mc:Ignorable="d"
        d:DataContext="{d:DesignInstance Type=vmns:DestinationChoiceViewModel, IsDesignTimeCreatable=True}"
        cal:Bind.AtDesignTime="True" Width="1280" Height="1024">
    <Window.Resources>
        <vmns:DestinationChoiceViewModel x:Key="ViewModelKey" />
    </Window.Resources>

I need to subscribe for the events of the ViewModel. How to accomplish this if I have defined the reference to the ViewModel in Window.Resources and use it for the binding further in xaml? I quite don't understand how to use the same reference.