Roll-up Buttons (similar to CorelDraw)
BCGControlBar Pro (MFC)
BCGSuite (MFC)
BCGControlBar for .NET
There is a special type of control bar that has the ability to drop down or pop up when the user holds a "top-level" toolbar button for a while. The drop-down toolbar button has a small arrow at the right-bottom corner of it. Drop-down toolbars can't be customized, docked, or have the tear-off state.
Highlighted roll-up button:
Pressed roll-up button with drop down toolbar: