Is it possible to add a TrackBar control to a ContextMenu? So when I right click, my ContextMenu will drop down and a TrackBar will appear as a menu item?
If your context menu is a ContexMenuStrip, you can create an item in this way:
[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.MenuStrip | 
                                   ToolStripItemDesignerAvailability.ContextMenuStrip)]
public class TrackBarMenuItem : ToolStripControlHost
{
    private TrackBar trackBar;
    public TrackBarMenuItem():base(new TrackBar())
    {
        this.trackBar = this.Control as TrackBar;
    }
    // Add properties, events etc. you want to expose...
}
Thanks to the ToolStripItemDesignerAvailability attribute, you can even see the item in the Forms Designer, as shown in the image below:

P.S.
This solution comes from this MSDN example 
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