Nothing special for add two buttons in the header.

Code:

    <mob:MobilePage ID="mbPage1" runat="server">
        <Header>
            <mob:IconLinkButton runat="server" Text="Back" Url="#" Icon="Back"/>
            <h1>Two buttons in in header example</h1>
            <mob:IconLinkButton runat="server" Text="Delete" Url="#" Icon="Delete"/>
        </Header>
        <Content>
            <p>This is an example to set 2 buttons inside a page header.</p>
        </Content>
        <Footer>
            <h1>Footer</h1>
        </Footer>
    </mob:MobilePage>

Result: