[Bug] Only Button has the styling classes

[sn4k3]

Check the following items

• I have looked up relevant Issue

Description of the issue

The classes like Flat only exists on Button. Other Buttons like Toggle, Split, etc does not have them.

Package Version

6.0.0

Environment

Windows 11

Expected Behavior

Styling classes to be present on other buttons as well.

Reproduction

<SplitButton Content="{materialIcons:MaterialIconExt Kind=Add}" Classes="Flat"/>

Additional Information

No response

[fntc]

@kikipoulet Issue is not fixes on android/iOS - created a PR to fix the code properly