C# - Get Content Page To Change Master Page Control?

Mar 5, 2011

Master page:

<form runat="server">
<Scirra:MainMenu runat="server" ID="MainMenu" TopTabSelected="home" SubTabSelected="link2" />
<asp:ContentPlaceHolder id="MainContent" runat="server">
snip

Content page:

Master.MainMenu.TopTabSelected = "forum";

I know I'm probably doing this wrong, but is this possible? I want to change a parameter of that control. It says 'inaccessible due to protection level'.

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