You can attach listeners to that particular element like
{
xtype: 'panel',
itemId: 'thePanel',
html: 'THIS WILL HOLD THE VIEWS CONTENT',
listeners: {
painted: function(){
alert('hey!');
}
}
}
As painted is not dependent on individual element and it acts on page scope also U can write it in views directly
items: [
],
listeners: {
painted: function () {
alert('hey!');
}