Thank you for writing.
I have prepared a small video demonstrating how to modify the button theme to show a border only at the bottom. Basically you need to:
- Remove the currently applied repository for the desired state
- Create your own repository with BorderBoxStyle = FourBorders, and the width of all borders but the bottom one should be 0
- Apply this repository
- Remove the Shape from the main element (as FourBorders does not work with shapes)
I hope that you find this useful.
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