Currently, setting an [End] KeyTrigger will take action on Studio's interface, rather than within the played Page, and will display Studio's Code Preview Debug Window.

Repro Steps:

1) Create a Studio Project featuring a MainPage.xaml
2) Introduce a TextBlock to the Page, rename it to a 'MyText', and set its Visibility to 'Hidden'.
3) Introduce a Button to the Page, and rename it to 'MyButton'

3) Navigate to the Interactivity/Triggers Panel, and create a new KeyTrigger on the PageRoot with:

Key: End
Modifiers: None
Fire On: KeyDown
Active on Focus: Unchecked
Conditions: None

Actions: ChangePropertyAction
Target: MyText
Property Name: Visibility
Value: Visible
Enabled: Checked

3) Navigate to the Interactivity/Triggers Panel, and create a new EventTrigger on the PageRoot with:

Source: <Self>
Event: Loaded
Conditions: None

Action: SetFocusAction
Target: MyButton
Engage: Checked
Enabled: Checked

4) Press 'Play' to Play the Page

5) Press the [End] Key on the Keyboard.

Observe how instead of making the TextBlock visible, Studio's Code Preview Debug Window is displayed.

Expected Results: Keys pressed in Play mode apply to the Page, and not to Studio's UI.