# RibbonMenuButton.DropDownOpening Event

> Occurs as the RibbonMenuButton's drop-down menu is opening.

- **Product:** TX Text Control .NET for Windows Forms
- **Section:** Reference
- **Kind:** Event
- **Introduced:** 24.0
- **Namespace:** `TXTextControl.Windows.Forms.Ribbon`
- **Package:** `TXTextControl.TextControl.WinForms.SDK` (assembly `TXTextControl.Windows.Forms.dll`, from the private NuGet feed or Text Control Offline Packages)
- **.NET Framework:** reference `TXTextControl.Windows.Forms.dll` from the setup
- **Path:** TX Text Control .NET for Windows Forms > Reference > TXTextControl.Windows.Forms.Ribbon > RibbonMenuButton.DropDownOpening Event
- **286 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-windows-forms-ribbon/ribbonmenubutton/dropdownopening-event/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-windows-forms-ribbon/ribbonmenubutton/dropdownopening-event/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-windows-forms-ribbon/ribbonmenubutton/dropdownopening-event/llms-full.txt

---

### Description

Occurs as the RibbonMenuButton's drop-down menu is opening.

### Syntax

```csharp
public event EventHandler DropDownOpening;
```

```vbnet
Public Event DropDownOpening As EventHandler
```

### Examples

The following example records useful context when drop down opening occurs.

```csharp
ribbonMenuButton.DropDownOpening += (sender, e) =>
{
    Console.WriteLine($"Drop Down Opening at {DateTime.Now:u}");
};
```

```vbnet
AddHandler ribbonMenuButton.DropDownOpening,
    Sub(sender, e)
        Console.WriteLine($"Drop Down Opening at {DateTime.Now:u}")
    End Sub
```

---

## Nearby

- **Previous:** [RibbonMenuButton.DropDownItems Property](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-windows-forms-ribbon/ribbonmenubutton/dropdownitems-property/llms-full.txt)
- **Next:** [RibbonPageLayoutTab Class](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/reference/txtextcontrol-windows-forms-ribbon/ribbonpagelayouttab/llms-full.txt)