windows phone 7 - Get instance of AppBar Button -

in xaml have 2 different appbarrs in resources:

 <phone:phoneapplicationpage.resources>      <shell:applicationbar x:key="appbar1" isvisible="true">         <shell:applicationbariconbutton x:name="abmain1" iconuri="/icons/appbar.radeos.png" text="radeos"                                         click="abmain_click" />     </shell:applicationbar>      <shell:applicationbar x:key="appbar2" isvisible="true">         <shell:applicationbariconbutton x:name="abmain" iconuri="/icons/appbar.radeos.png" text="radeos"                                         click="abmain_click" />         <shell:applicationbariconbutton x:name="ablast" iconuri="/icons/appbar.back.rest.png" text="last"                                         click="ablast_click" />         <shell:applicationbariconbutton x:name="abnext" iconuri="/icons/appbar.next.rest.png" text="next"                                         click="abnext_click" />         <shell:applicationbariconbutton x:name="abclosepopup" iconuri="/icons/appbar.cancel.rest.png" text="close"                                         click="abclosepopup_click" />     </shell:applicationbar>  </phone:phoneapplicationpage.resources> 

and switch in code, when need using:

applicationbar = (microsoft.phone.shell.applicationbar) resources["appbar1"]; 

or

applicationbar = (microsoft.phone.shell.applicationbar) resources["appbar2"]; 

question is: how instance of appbarr buttons (ex. abmain1) in place in code?
visual studio see field, null (because in resources).

you should able access so

applicationbariconbutton abmain1button = (applicationbariconbutton) applicationbar.buttons[0];