protected virtual string GetCallbackScript (IButtonControl control, string argument)
{
if (EnableSortingAndPagingCallbacks) {
Page page = Page;
if (page != null)
page.ClientScript.RegisterForEventValidation (UniqueID, argument);
return "javascript:GridView_ClientEvent (\"" + ClientID + "\",\"" + control.CommandName + "$" + control.CommandArgument + "\"); return false;";
} else
return null;
}