AJAX :: Cannot Invoke Button Inside Update Panel

in have button inside updatepanel

when button this clicked, it do some thing and finally invoke another Button by Javascript by ServerSide as Follow:

protected void Buttton1_Click......
{
doSomeThing();
InvokeRemoteButton();
}
public void InvokeRemoteButton()
{

some thing like this

string phrse="<script type ...........etc............. Button1.click()........etc...</script>";
}

this is work when button outside update panel , but when i put it inside update panel , the Button Event will not fire !