Use the MenuBar.DisplayMode property to determine the layout of the MenuBar object. To make a horizontal MenuBar, set:
On order to make the horizontal MenuBar drag-able or dock-able (absolutely positioned on the page), set the MenuBar.AbsoluteDockEnabled and MenuBar.AbsoluteDragEnabled properties to true.
The location of the MenuBar when the page loads can be controlled with the AbsoluteLeft, AbsoluteTop and AbsoluteDockState properties:
The MenuBar will now be rendered at the location on the page indicated by these properties. The MenuBar's width is controlled automatically and will be the minimum amount possible while undocked and the width of the page when docked.