This member overrides ToolStripDropDown.SetVisibleCore(Boolean), and more complete documentation might be available in that topic.
Adjusts the size of the owner ToolStrip to accommodate the ToolStripDropDown if the owner ToolStrip is currently displayed, or clears and resets active ToolStripDropDown child controls of the ToolStrip if the ToolStrip is not currently displayed.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.