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 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.