To handle platform-specific features in a cross-platform GUI:

1. Abstract platform-specific functionality using interfaces or abstract classes.

2. Implement platform-specific code in separate modules or classes.

3. Use conditional compilation or preprocessor directives.

4. Utilize platform-specific libraries or frameworks.

5. Employ runtime detection of platform features.

6. Provide fallbacks or alternatives for unsupported features.

7. Use platform-agnostic APIs or libraries.

8. Implement platform-specific workarounds or hacks.

9. Document platform-specific differences and limitations.

10. Test thoroughly on each target platform.

Additionally:

1. Use feature detection instead of platform detection.

2. Design platform-agnostic UI and functionality.

3. Leverage cross-platform libraries and frameworks.

4. Avoid platform-specific assumptions.

5. Emulate missing features on unsupported platforms.

By using these strategies, you can effectively handle platform-specific features in a cross-platform GUI, ensuring a consistent and functional user experience across multiple platforms.