Currently, the DropShadow Effect offers a number of Properties, including a 'Shadow Depth' Property.

This is a value which is able to be set between 0 and 300. However, in Studio, this value can be set to -Negative values, which results in the Effect not being rendered at all.

See attached screenshot.

Repro Steps:

1) Create a Studio Project featuring a MainPage.xaml

2) Introduce a TextBlock to the Page.

3) Apply a DropShadow Effect to the TextBlock introduced in Step 2), set its Properties to make the effect visible on-Stage, using a +Positive value as the 'Shadow Depth' Property value.

Observe how Effect renders as expected.

4) Change the 'Shadow Depth' Property to a -Negative value.

Observe how the Effect no longer renders.

Expected Results: The 'Shadow Depth' Property value forces a 'clamp' between 0 and 300 to prevent invalid values for the field.