Toolbar SelectButton values appear behind window

Suite and Optimus Suite 6
#1

When a toolbar is attached to a window, and a selectButton is used on the toolbar, the nested items appear behind the window instead of on top.

Snippet demonstrating the issue

#2

Pleas,e try to change the z-index of the menu items:
https://snippet.dhtmlx.com/uercewiz

.dhx_menu{
z-index: 2147483646;
}
</style>
#3

That works, thank you!