How to access the master page control property from child pages?

hi everybody i am developing one web application in that i used one master page and one more page that contain content in that page i used one iframe to load another page. now the problem is


i cant able to access the master page control property from my iframe loaded page. but i can access the master page property if i not use the iframe in content page.how to solve this problem please any one help me.if you know. thanks in advance.How to access the master page control property from child pages?
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