# DropDown.ICallback interface

Namespace: [Eto.Forms](https://eto.picoe.ca/api/namespace/eto.forms.md) · Assembly: [Eto](https://eto.picoe.ca/api/assembly/eto.md)

```cs
public interface DropDown.ICallback : ListControl.ICallback
```

Callback interface for the [DropDown](https://eto.picoe.ca/api/type/eto.forms.dropdown.md) control.

**Derived types:** [ComboBox.ICallback](https://eto.picoe.ca/api/type/eto.forms.combobox.icallback.md), [DropDown.Callback](https://eto.picoe.ca/api/type/eto.forms.dropdown.callback.md)

## Methods

- [OnDropDownClosed](https://eto.picoe.ca/api/type/eto.forms.dropdown.icallback/ondropdownclosed.md)
- [OnDropDownOpening](https://eto.picoe.ca/api/type/eto.forms.dropdown.icallback/ondropdownopening.md)
- [OnFormatItem](https://eto.picoe.ca/api/type/eto.forms.dropdown.icallback/onformatitem.md)

## Inherited Members

- From [ListControl.ICallback](https://eto.picoe.ca/api/type/eto.forms.listcontrol.icallback.md): [OnSelectedIndexChanged](https://eto.picoe.ca/api/type/eto.forms.listcontrol.icallback/onselectedindexchanged.md)
- From [Control.ICallback](https://eto.picoe.ca/api/type/eto.forms.control.icallback.md): [OnDragDrop](https://eto.picoe.ca/api/type/eto.forms.control.icallback/ondragdrop.md), [OnDragEnd](https://eto.picoe.ca/api/type/eto.forms.control.icallback/ondragend.md), [OnDragEnter](https://eto.picoe.ca/api/type/eto.forms.control.icallback/ondragenter.md), [OnDragLeave](https://eto.picoe.ca/api/type/eto.forms.control.icallback/ondragleave.md), [OnDragOver](https://eto.picoe.ca/api/type/eto.forms.control.icallback/ondragover.md), [OnEnabledChanged](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onenabledchanged.md), [OnGotFocus](https://eto.picoe.ca/api/type/eto.forms.control.icallback/ongotfocus.md), [OnKeyDown](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onkeydown.md), [OnKeyUp](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onkeyup.md), [OnLostFocus](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onlostfocus.md), [OnMouseDoubleClick](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onmousedoubleclick.md), [OnMouseDown](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onmousedown.md), [OnMouseEnter](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onmouseenter.md), [OnMouseLeave](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onmouseleave.md), [OnMouseMove](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onmousemove.md), [OnMouseUp](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onmouseup.md), [OnMouseWheel](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onmousewheel.md), [OnShown](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onshown.md), [OnSizeChanged](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onsizechanged.md), [OnTextInput](https://eto.picoe.ca/api/type/eto.forms.control.icallback/ontextinput.md), [OnThemeChanged](https://eto.picoe.ca/api/type/eto.forms.control.icallback/onthemechanged.md)