Author: Bazzer747

1. Create a FireMonkey Multi-Device Application
2. Place your UI controls onto your form
3. Browse to the StyleLookUp property for each control and select a style element (you can also do this after following the steps below)
4. Drop TStyleBook onto your form
5. Set the Form’s StyleBook property to StyleBook1
6. Double-click on the StyleBook component on your form to open the integrated Style Designer
7. Click on the green plus icon next to the “Platform” drop down menu
8. Select “Windows” and click ‘Select’
9. Select “Default” from the “Platform” drop-down menu and click the red x to delete it 
10. With “Windows” selected from the “Platform” drop-down menu, click the green open button on the toolbar
11. Select a premium Windows style, i.e. EmeraldCrystal.style
12. Repeat steps 7 – 11 to add a custom macOS style, i.e. CoralCrystal.style
13. Click on the “x” to close the style designer. Select “Apply and Close” when prompted. 
14. In the FireUI Multi-Device Designer, toggle between Windows and OSX to view the 2 different styles.

15. Deploy your application to Windows and macOS to see the style at runtime.

Let’s take a look at how you can create WinAPI Calendar in this article about RAD Studio 10.2.

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