WP8 application crashes with an access violation exception when trying to slide a slider in the nGUI example scene.

To reproduce:
1. Import nGUI from the asset store
2. Switch platform to WP8 and include Example 0 - Control Widgets scene in the build
3. Build & run
4. Try to slide any slider - crash

Debugging with Visual Studio reveals that an access violation exception is thrown, with no inner exception.

Regression since 4.5.4f1