Question:Which is the correct config option for toolbar button handler in ExtJS? 

A {
 xtype:'tbbutton',
 text:'Button',
 handler:function(){
   Ext.Msg.alert('Boo','Here I am');
  }
} 
B {
 xtype:'tbbutton',
 text:'Button',
 listener:function(){
   Ext.Msg.alert('Boo','Here I am');
  }
} 
C {
 xtype:'tbbutton',
 text:'Button',
 eventr:function(){
   Ext.Msg.alert('Boo','Here I am');
  }
} 
D {
 xtype:'tbbutton',
 text:'Button',
 click:function(){
   Ext.Msg.alert('Boo','Here I am');
  }
} 

+ Answer
A 

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Mohammad Towhidul Islam

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