Dear , 

i'm new on angular 2 , and currently learning on directives . Based on this 
example 
https://angular.io/resources/live-examples/attribute-directives/ts/plnkr.html
in my understanding, on   file *app/app.component.html*
when i click on radio button for example green, it will set variable : 
color to "green". 
but when i programmatically replace variable color for with example : 
"red", 
why the ngOnChanges not called as it called with --> 
* (click)="color='cyan'"*
 
is there is some way to change the class property and fire change 
notification 

thx before
best regards, 
 

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