Handling lots of menu entries

I wanted to add the ability to change the opacity to
my GUI app. I added a 10 of menu entries with 10
handlers. It was grotesque! Is there a better way?

void Form1::Opacity100(System::Object* s,
System::EventArgs* e){
  Opacity = 1.0;
}
void Form1::Opacity90(System::Object* s,
System::EventArgs* e){
  Opacity = .9;
}
void Form1::Opacity80(System::Object* s,
System::EventArgs* e){
  Opacity = .8;
}

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