Here is base sample for image case

Fancy.defineController('imageControll', {
  controls: [{
    event: 'cellclick',
    selector: 'img.image-class',
    handler: 'onClickImage'
  }],
  onClickImage: function() {
    var me = this;

    //Your action
  }
});

var grid = new FancyGrid({
  ...
  controllers: ['imageControll'],
  ...
});

For buttons, all is much simpler
<style>
.action-column-detalhes {
  ...
}

.action-column-delete {
  ...
}
</style>
columns: [{
   ...
},{
  type: 'action',
  width: 65,
  items: [{
	text: 'DETALHES',
    cls: 'action-column-detalhes',
    handler: function(grid, o){
	  //Action detalhes
	}
  },{
    text: 'Delete',
    cls: 'action-column-delete',
    handler: function(grid, o){
	  //Action delete
	}
  }]
}]