QTP unables to identify pop up window

There are couple of scenarios where we perform some operations in a application, where a pop up window will appear like:
1. When you delete a user/emp, it will display a pop up saying "Do you want to Delete the user?"
2. You choose some pop up menu option, then a pop up window may be displayed with the selected items functionality.

For sometimes, even though you have the correct recorded script, it may throw you an error saying the object does not exist.

Ex: B("XYZ").Dialog("Delete User").WinButton("Ok").click    may throw error saying "Object not visible".

How to overcome this error?

Cause: The "visible" property of the Parent object may not enabled.

Solution: Goto Tools -> Object Identification -> Choose Environment type -> Choose the object class(in our case Browser is the parent to the Dialog box) -> Click on Add/Remove property -> select "visible" property.
After visibility property is configured, now re-record the steps.

Now QTP should be able to identify the pop up window.