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DropDownOpened Event
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ComboBox.DropDownOpened Event

Occurs when the drop-down list of the combo box opens.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public event EventHandler DropDownOpened
<object DropDownOpened="EventHandler" .../>

The following example shows how to assign event handlers and handle the DropDownOpened and DropDownClosed events.

<ComboBox Name="cb" StaysOpenOnEdit="true" IsEditable="true" DropDownOpened="OnDropDownOpened" 
        DropDownClosed="OnDropDownClosed">
void OnDropDownOpened(object sender, EventArgs e)
{
    if (cb.IsDropDownOpen == true)
    {
        cb.Text = "Combo box opened";
    }
}

void OnDropDownClosed(object sender, EventArgs e)
{
    if (cb.IsDropDownOpen == false)
    {
        cb.Text = "Combo box closed";
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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