dropdown overlapping menu while using user control in ASP.NET

[shh1]

My work involves coding in user control of ASP.NET. The whole project has user controls.
User control page encapsulates other web controls.
But the problem is that, when i run the page, and mouse is moved over menu, dropdown control defined in user control
hides the menuitem under the menu, which is not ideal situation from user point of view.

so is there any property for dropdown control to avoid this problem?or is there any relation
between user control and web control while designing the form?


Thanks and Regards in advance

waiting for reply ASAP