Gets or sets the System.Windows.Forms.ToolStripDropDown that will be displayed when this System.Windows.Forms.ToolStripDropDownItem is clicked.
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If no System.Windows.Forms.ToolStripDropDown is associated with the System.Windows.Forms.ToolStripDropDownItem, a call to ToolStripDropDownItem.CreateDefaultDropDown creates a generic drop-down control.
If a drop-down control is automatically generated, which means that items are added to the collection, and you then set the ToolStripDropDownItem.DropDown property to an explicit drop-down control, you might lose data.