Navigation Bar Button Issue

[rocket]

Hello. Using Xara Designer Pro X, I've created a 6 button navigation bar with mouse over effects for each button. When the cursor hovers over or clicks on each button, the color of that button changes. That part works fine, but I want the button labeled "Illustrations" also have a submenu. When I hover over or click on that specific button, the color changes, but the submenu doesn't display. What type of link should I have set for this button? I've tried linking the button to just a random symbol (#), which allows for the button to change color, but the submenu doesn't work. Likewise scenario when I link the button to a random page within the site. I've also tried linking the button to NO URL, but then the button color doesn't change (and the submenu doesn't appear either.)

What I want is a button that will change color AND will also display a submenu underneath it. Any ideas would be most appreciated. Thanks.