System.Windows.Forms 2.0.0.0 System.Enum To be added. Specifies the reason that a control was closed. Field System.Windows.Forms.ToolStripDropDownCloseReason Specifies that the control was closed because an application was launched. 2.0.0.0 Field System.Windows.Forms.ToolStripDropDownCloseReason Specifies that the control was closed because another application has received the focus. 2.0.0.0 Field System.Windows.Forms.ToolStripDropDownCloseReason Specifies that the control was closed because the method was called. 2.0.0.0 Field System.Windows.Forms.ToolStripDropDownCloseReason Specifies that the control was closed because one of its items was clicked. 2.0.0.0 Field System.Windows.Forms.ToolStripDropDownCloseReason Specifies that the control was closed because of keyboard activity, such as the ESC key being pressed. 2.0.0.0