![angular - Is there any way to visually notify the user that nothing has been set for the mat-button-toggle-group? - Stack Overflow angular - Is there any way to visually notify the user that nothing has been set for the mat-button-toggle-group? - Stack Overflow](https://i.stack.imgur.com/GuqZU.png)
angular - Is there any way to visually notify the user that nothing has been set for the mat-button-toggle-group? - Stack Overflow
Outer md-button-toggle within md-button-toggle-group do not have round corners when selected or disabled · Issue #6689 · angular/components · GitHub
Outer md-button-toggle within md-button-toggle-group do not have round corners when selected or disabled · Issue #6689 · angular/components · GitHub
![Feature Request: md-button-toggle-group color options (primary, accent, warn) · Issue #7162 · angular/components · GitHub Feature Request: md-button-toggle-group color options (primary, accent, warn) · Issue #7162 · angular/components · GitHub](https://user-images.githubusercontent.com/940070/30573173-97ded1c4-9d35-11e7-90f6-d06411f268ff.png)