Asp.net menu control 2.0

[iiman]

I recently converted 1.1 application to 2.0

I am using asp.net menu control and everytime dynamic menu is expanded, the
dropdown controls (just the dropdown controls!!!) in the body of the html
shifts to the left in a split second and comes back to the original place.
Is there something I have to do in CSS file as far as positioning of the
menu is concerned?

#Menu

{
height: 23px;
background-image: url(MenuBackground.gif);
border-right: #282773 0px solid;
border-top: #282773 0px solid;
border-bottom: #282773 0px solid;
position: relative; /* without this property, the menu will always create
vertical scrollbar*/
}