Drop down menu urgent please

Hello there. Does anyone know how to make a dynamic drop down menu? I mean I have a button I press it and it ones the drop down menu in a movieClip. I close the movieClip and I press another button and the drop down menu appears again but with different content. The length of the menu is given by the length of an array, and the content of the menu are colors that have to change every time I press another button.
Thank you.