Define section in layout

[Alirezamn93]

hi guys.
I have multiple files inside ./views folder, _layout.html, view.html and search.html
in _layout.html I have {{template "PageCSS" .}} and in view.html and search.html I customized it by {{define "PageCSS"}}....{{end}}
and my go code is

tmpl := iris.HTML("./views", ".html")
tmpl.Layout("\_layout.html")
rp.RegisterView(tmpl)


rp.Get("/search", func(ctx iris.Context) {
	ctx.View("search.html")
})
rp.Get("/view", func(ctx iris.Context) {
	ctx.View("view.html")
})`

but when I run it and go to search page I see view.html {{define "PageCSS"}}....{{end}} part
what should I do?
in fact it renders {{define "PageCSS"}}....{{end}} part of last .html file in ./views folder for all other .html files