ComboBox.DropDown (Evento)

public event EventHandler DropDown

/** @event */
public void add_DropDown (EventHandler value)

/** @event */
public void remove_DropDown (EventHandler value)

En JScript, se pueden controlar los eventos que define una clase, pero no se pueden definir unos propios.

No aplicable.

// Declare ComboBox1.
internal System.Windows.Forms.ComboBox ComboBox1;

// Initialize ComboBox1.
private void InitializeComboBox()
{
    this.ComboBox1 = new ComboBox();
    this.ComboBox1.Location = new System.Drawing.Point(128, 48);
    this.ComboBox1.Name = "ComboBox1";
    this.ComboBox1.Size = new System.Drawing.Size(100, 21);
    this.ComboBox1.TabIndex = 0;
    this.ComboBox1.Text    = "Typical";
    string[] installs = new string[]{"Typical", "Compact", "Custom"};
    ComboBox1.Items.AddRange(installs);
    this.Controls.Add(this.ComboBox1);
    
    // Hook up the event handler.
    this.ComboBox1.DropDown +=  
        new System.EventHandler(ComboBox1_DropDown);
}

// Handles the ComboBox1 DropDown event. If the user expands the  
// drop-down box, a message box will appear, recommending the
// typical installation.
private void ComboBox1_DropDown(object sender, System.EventArgs e)
{
    MessageBox.Show("Typical installation is strongly recommended.", 
    "Install information", MessageBoxButtons.OK, 
        MessageBoxIcon.Information);
}

// Declare comboBox1.
System.Windows.Forms.ComboBox comboBox1;

// Initialize comboBox1.
private void InitializeComboBox()
{
    this.comboBox1 = new ComboBox();
    this.comboBox1.set_Location(new System.Drawing.Point(128, 48));
    this.comboBox1.set_Name("comboBox1");
    this.comboBox1.set_Size(new System.Drawing.Size(100, 21));
    this.comboBox1.set_TabIndex(0);
    this.comboBox1.set_Text("Typical");
    String installs[] = new String[] { "Typical", "Compact", "Custom" };
    comboBox1.get_Items().AddRange(installs);
    this.get_Controls().Add(this.comboBox1);
    // Hook up the event handler.
    this.comboBox1.add_DropDown(new System.EventHandler(
        comboBox1_DropDown));
} //InitializeComboBox

// Handles the comboBox1 DropDown event. If the user expands the  
// drop-down box, a message box will appear, recommending the
// typical installation.
private void comboBox1_DropDown(Object sender, System.EventArgs e)
{
    MessageBox.Show("Typical installation is strongly recommended.", 
        "Install information", MessageBoxButtons.OK, 
        MessageBoxIcon.Information);
} //comboBox1_DropDown