I'm afraid your demo project shows exactly the same behaviour as my real project but I have found in more details what is happening.
You can see here (link
) that there is loads of white space (marked in red) next to the controls. Given that the div which the "Go" linkButton is in has text-align:right, you can see where the edge of the div is so this is not pushing the right side of the menu item out.
The width of the menu item is always at least
271px. If the width property is set less than this it makes no difference, if it is more than this value, then the menu item expands.
Do you have any other ideas how I can get rid of the whitespace?