WPF MVVM ListView does not update! -

i'm using prism v4 , , mvvm. in viewmodel have:

private tb_company tb;     public tb_company tb {         {             return this.tb;         }          private set {             if ( this.tb != value ) {                 this.tb = value;                 this.raisepropertychanged(() => this.tb);             }         }     } 

in page, have datagrid (i tried listview too, don't work!):

<datagrid itemssource="{binding tb.tb_address.rl_address_phone}" .../> 

rl_address_phone list of phones of company... so, in moment add phone list:

private void mycommand()  {     ...     tb.tb_address.rl_address_phone.add(         new rl_address_phone         {             tb_phone = new tb_phone                         {                             nu_phone = _txttelefone,                             st_type = _txttipotelefone                         }          });     ... } 

but nothing happens ui... in debug, list fullfiled.... should update ui?

the rl_address_phone property of tb_address must implement inotifypropertychanged well. if list, should use observablecollection implements inotifycollectionchanged necessary behaviour trying achieve.

also, piece of advise - have design guidelines , naming convention of c# language, can find in msdn (while says .net 1.1, still applies following versions of framework).