Creates a generic System.Windows.Forms.ToolStripDropDown for which events can be defined.
A generic System.Windows.Forms.ToolStripDropDown for which can be defined.
The ToolStripMenuItem.CreateDefaultDropDown method is automatically called if the ToolStripDropDownItem.DropDown property finds no System.Windows.Forms.ToolStripDropDown associated with the System.Windows.Forms.ToolStripDropDownItem.