Gets or sets a value indicating whether the System.Windows.Forms.ToolStripDropDown control should automatically close when it has lost activation.
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If you want a System.Windows.Forms.ToolStripDropDown that always stays open, set ToolStripDropDown.AutoClose to false.
Consider handling the ToolStripDropDown.Closing event instead of setting the ToolStripDropDown.AutoClose property. Inspect the ToolStripDropDownClosingEventArgs.CloseReason field in your ToolStripDropDown.Closing handler to specify custom closing logic.