C# - How To Access Other Controls Values In ITemplate

I want to have a control with template supporting so I can put a control on it and I can access them just by their name( just the way Updatepanles do)for instance:

<uc1:FramePanel ID="FramePanel1" runat="server">
<MessageTemplate>
<asp:Button ID="Button1" runat="server" Text="Button"></asp:Button>
</MessageTemplate>
</uc1:FramePanel>

and the in my code could access Button1 like that:

Button1.Text="dsdsdsds";

for now I can access it using find control and Im not happy with it

if you look at updatepanel you can access its control directly

<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:Button ID="Button1" runat="server" Text="Button"></asp:Button>
</ContentTemplate>
</asp:UpdatePanel>

ucan access button1 just easily:

Button1.Text="dsdsdsds";