More complicated than I wish to, but eventually I put on my child form this script that refer to a method on my parent form:
window.opener.createpostbackbyclick();
then, on my parent form I added an inivisible button that onclick, update my panel and by that, refresh the page. And the I do the click from the method I created (the same one I called on the child form)
first the method I created:
function createpostbackbyclick()
{
document.getelementbyid("btnclick").click();
}
then the button:
<asp:button id="btnclick" runat="server" onclick="refreshme" visible="false" xmlns:asp="#unknown" />
and the function:
function refreshme()
{
netpanel.update();
}
I also had to use session for my parameters but all in all - it works now