Ext.Msg not working properly

[alohainc]

I am using Ext.Msg.prompt in controller as show below

Ext.Msg.prompt({            
             title: 'Qty Left',             
             message: 'Please enter quantity left:',             
             width: 300,
             buttons: Ext.MessageBox.OKCANCEL,
             prompt: { maxlength: 180 },
             fn: msgBoxQtyLeftHandler
         });

but prompt is not shown. But when I refresh and then click, prompt is show. Not getting what is the problem.

[mitchellsimoens]

It's showing for me

[alohainc]

Is shows when I refresh the page, but not without refreshing. Is there any thing wrong I am doing?

[mitchellsimoens]

Your code worked on first page load for me.