These days we are shifting our software from 3 to 4 in 3.1 we had :

Code:
/*
Ext.define('Application.ClientGrid', {   // for 4.x
    extend: 'Ext.grid.Panel',
*/
Application.ClientGrid= Ext.extend(Ext.grid.GridPanel, {  // for 3.x
mainInfoBar : '',
otherInfoBar : '',
..
..
 initComponent: function() {
        this.mainInfoBar = this.buildMainInfoBar();
        this.bbar = this.otherInfoBar;  // initialized bar
}

listeners: {
       render:function(thisObject,eOpts ) {
                        this.mainInfoBar.render(this.bbar);
}
}

}
But this donot work any more in 4.x
Error:

Uncaught TypeError: Cannot read property 'insertAdjacentHTML' of null

My guess is that I dont see "render" function in toolbar ExtJs4 API is that the problem if yes then which new function is going to be used instead of this ? can some body please guide !!

any help will be appreciated!

Thanx
Wacky