Navigation with NavigateToScreenAction in WPF application

Question

I have some buttons in a SketchFlow Screen created by:

cloudButton buttonPin = new cloudButton();
MapCanvas.Children.add(buttonPin);

the XAML code for cloudButton is:

<Button Content="Button" Style="{DynamicResource PinCloudButton}">
 <i:Interaction.Triggers>
  <i:EventTrigger EventName="Click">
   <pi:NavigateToScreenAction TargetScreen="Protoripo1Screens.Screen_1_1"  />
  </i:EventTrigger>
 </i:Interaction.Triggers>
</Button>

therefore every button link to Screen_1_1 UserControl generated from SketchFlow.

THE PROBLEM: i want that every button send some info about itself to Screen_1_1, because i want that can auto-generate the contents page.

any Idea?