ToolStripDropDownItem::DropDownOpening Event
Occurs as the ToolStripDropDown is opening.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
For more information about handling events, see Handling and Raising Events.
The following code example demonstrates the use of this member. In the example, an event handler reports on the occurrence of the DropDownOpening event. This report helps you to learn when the event occurs and can assist you in debugging. To report on multiple events or on events that occur frequently, consider replacing MessageBox::Show with Console::WriteLine or appending the message to a multiline TextBox.
To run the example code, paste it into a project that contains an instance of a type that inherits from ToolStripDropDownItem, such as a ToolStripMenuItem or ToolStripDropDownButton. Then name the instance ToolStripDropDownItem1 and ensure that the event handler is associated with the DropDownOpening event.
Available since 2.0