Can you post the code you are using as a get/set accessor? Something a lot
of people make a mistake about is putting code into the page_load event of a
child control because they're used to doing it in the page. The page_load
takes place before that of the page's page_load event. That means that if
you set the property in the page it won't be accessible in the child
control, you need to use a later event, such as overriding the on-prerender
event.

Also, keep in mind that unless you're storing the property values into the
viewstate or another state management mechanism they values won't persist
unless they're specifically set. For example, to set a boolean property of a
child control into the viewstate you can use

public bool MyProperty
{
   get {
       if(ViewState["MyProperty"] != null)
           return (bool)ViewState["MyProperty"];
       else
           return false;
   }
   set{ ViewState["MyProperty"]  = value;}
}