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ToolStripDropDownItem.DropDownOpened Event

Occurs when the ToolStripDropDown has opened.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public event EventHandler DropDownOpened

This event occurs when the user clicks the drop down item or when you call the ShowDropDown method. You can use this event to dynamically populate the ToolStripDropDown.

For more information about handling events, see Consuming Events.

The following code example demonstrates how to handle the DropDownOpened event for multiple ToolStripDropDownItem controls. This code example is part of a larger example provided for the ToolStripDropDownItem class.

// This method handles the DropDownOpened event from a 
// ToolStripDropDownItem. It displays the value of the 
// item's Text property in the form's StatusStrip control.
void toolStripDropDownItem_DropDownOpened(object sender, EventArgs e)
    ToolStripDropDownItem item = sender as ToolStripDropDownItem;

    string msg = String.Format("Item opened: {0}", item.Text);
    this.toolStripStatusLabel1.Text = msg;

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.