c# - how to hide the master page content in a web page -

i want open regular .aspx page in rad window.but regular page consists of site map.i don't want sitemap displayed when opened in rad window. please suggest me solution.

i tried this:
this.masterpagefile="..//test.master"; in page not work

so have contentplaceholders automatically inherit master page. if go regular .aspx page , head design view see sections content master page. if click little right arrow right of area looks div, should able change content have in regular aspx page.