Siebel Asynchronous

According to Siebel asynchronous call back methods, I have tried the below approach to invoke a service and passing ai as additional input.

My objective is to trigger a vbc call like in ajax where i would be able to work on other applets, and this particular applet based on vbc alone would should show self busy symbol.

var ai= {};

ai.async = false;

ai.selfbusy = false;

ai.scope = this;

ai.cb ={

  };

My PR file triggers the vbc call but the whole view gets loaded only after I have received a response.

Will this functionality help me achieve what i want or is this asynchronous approach for something else.