How do I distroy an object when clicking on the x?

[RubyTigerSG]

Hi Gurus,

I have a gui which calls another gui like so:

if (userManager==0)
{
    userManager =  new UserManager();
 
}
userManager->show();

if (userManager==0)
{
    userManager =  new UserManager();

}
userManager->show();

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This then launches the user manager window. So now how do I make sure that the ~UserManager gets executed when someone closes the window by clicking on the x?

I know I should delete the reference to UserManager, but where do I do this?

Thanks a million
RT