Show Menu on Blank aspx page

Remove from page:
<asp:Content ContentPlaceHolderId="PlaceHolderLeftNavBar" runat="server"></asp:Content>
<asp:Content ContentPlaceHolderId="PlaceHolderNavSpacer" runat="server"></asp:Content>

Find the "PlaceHolderPageImage" and add image:
<asp:Content ContentPlaceHolderId="PlaceHolderPageImage" runat="server"><IMG SRC="/_layouts/images/blank.gif" width=1 height=1 alt=""></asp:Content>