# TreeGridView.Callback class

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

```cs
protected class TreeGridView.Callback : Grid.Callback, TreeGridView.ICallback
```

Callback implementation for handlers of [TreeGridView](https://eto.picoe.ca/api/type/eto.forms.treegridview.md)

## Methods

- [OnActivated](https://eto.picoe.ca/api/type/eto.forms.treegridview.callback/onactivated.md): Raises the activated event.
- [OnCollapsed](https://eto.picoe.ca/api/type/eto.forms.treegridview.callback/oncollapsed.md): Raises the collapsed event.
- [OnCollapsing](https://eto.picoe.ca/api/type/eto.forms.treegridview.callback/oncollapsing.md): Raises the collapsing event.
- [OnExpanded](https://eto.picoe.ca/api/type/eto.forms.treegridview.callback/onexpanded.md): Raises the expanded event.
- [OnExpanding](https://eto.picoe.ca/api/type/eto.forms.treegridview.callback/onexpanding.md): Raises the expanding event.
- [OnSelectedItemChanged](https://eto.picoe.ca/api/type/eto.forms.treegridview.callback/onselecteditemchanged.md): Raises the selected item changed event.

## Inherited Members

- From [Grid.Callback](https://eto.picoe.ca/api/type/eto.forms.grid.callback.md): [OnCellClick](https://eto.picoe.ca/api/type/eto.forms.grid.callback/oncellclick.md), [OnCellDoubleClick](https://eto.picoe.ca/api/type/eto.forms.grid.callback/oncelldoubleclick.md), [OnCellEdited](https://eto.picoe.ca/api/type/eto.forms.grid.callback/oncelledited.md), [OnCellEditing](https://eto.picoe.ca/api/type/eto.forms.grid.callback/oncellediting.md), [OnCellFormatting](https://eto.picoe.ca/api/type/eto.forms.grid.callback/oncellformatting.md), [OnColumnHeaderClick](https://eto.picoe.ca/api/type/eto.forms.grid.callback/oncolumnheaderclick.md), [OnColumnOrderChanged](https://eto.picoe.ca/api/type/eto.forms.grid.callback/oncolumnorderchanged.md), [OnColumnWidthChanged](https://eto.picoe.ca/api/type/eto.forms.grid.callback/oncolumnwidthchanged.md), [OnRowFormatting](https://eto.picoe.ca/api/type/eto.forms.grid.callback/onrowformatting.md), [OnSelectionChanged](https://eto.picoe.ca/api/type/eto.forms.grid.callback/onselectionchanged.md)
- From [Control.Callback](https://eto.picoe.ca/api/type/eto.forms.control.callback.md): [OnDragDrop](https://eto.picoe.ca/api/type/eto.forms.control.callback/ondragdrop.md), [OnDragEnd](https://eto.picoe.ca/api/type/eto.forms.control.callback/ondragend.md), [OnDragEnter](https://eto.picoe.ca/api/type/eto.forms.control.callback/ondragenter.md), [OnDragLeave](https://eto.picoe.ca/api/type/eto.forms.control.callback/ondragleave.md), [OnDragOver](https://eto.picoe.ca/api/type/eto.forms.control.callback/ondragover.md), [OnEnabledChanged](https://eto.picoe.ca/api/type/eto.forms.control.callback/onenabledchanged.md), [OnGotFocus](https://eto.picoe.ca/api/type/eto.forms.control.callback/ongotfocus.md), [OnKeyDown](https://eto.picoe.ca/api/type/eto.forms.control.callback/onkeydown.md), [OnKeyUp](https://eto.picoe.ca/api/type/eto.forms.control.callback/onkeyup.md), [OnLostFocus](https://eto.picoe.ca/api/type/eto.forms.control.callback/onlostfocus.md), [OnMouseDoubleClick](https://eto.picoe.ca/api/type/eto.forms.control.callback/onmousedoubleclick.md), [OnMouseDown](https://eto.picoe.ca/api/type/eto.forms.control.callback/onmousedown.md), [OnMouseEnter](https://eto.picoe.ca/api/type/eto.forms.control.callback/onmouseenter.md), [OnMouseLeave](https://eto.picoe.ca/api/type/eto.forms.control.callback/onmouseleave.md), [OnMouseMove](https://eto.picoe.ca/api/type/eto.forms.control.callback/onmousemove.md), [OnMouseUp](https://eto.picoe.ca/api/type/eto.forms.control.callback/onmouseup.md), [OnMouseWheel](https://eto.picoe.ca/api/type/eto.forms.control.callback/onmousewheel.md), [OnShown](https://eto.picoe.ca/api/type/eto.forms.control.callback/onshown.md), [OnSizeChanged](https://eto.picoe.ca/api/type/eto.forms.control.callback/onsizechanged.md), [OnTextInput](https://eto.picoe.ca/api/type/eto.forms.control.callback/ontextinput.md), [OnThemeChanged](https://eto.picoe.ca/api/type/eto.forms.control.callback/onthemechanged.md)