Problem with submenu appearing behind server controls on screen

Hi
I have a small problem where the sub menu items appear behind my server controls on the screen, and I don't how to correct the problem. Basically, when I roll mouse over the asp:menu control on a link, the sub menu appears, but if there is another control on the page, such a text box, or a label or even a gridview, rather than laying on top those controls, thus making the sub menu items all visible, the sub menu appears behind them instead.
My mark up is below, and I really do need some help, because I am stumped!



<asp:menu id="MenuList" runat="server" CssClass="MenuStyle" StaticMenuItemStyle-CssClass="MenuStatic">

<DynamicHoverStyle CssClass="DHoverStyle"/>

<DynamicSelectedStyle CssClass="DSStyle"/>

<DynamicMenuItemStyle CssClass="DMenuStyle"/>

<StaticHoverStyle CssClass="MenuHov ...