---
title: "IVObjectHost Members"
canonical: https://www.graphicsmill.com/docs/gm5/AllMembers_T_Aurigma_GraphicsMill_WinControls_IVObjectHost.htm
product: "Graphics Mill 5.5 for .NET"
---
This documentation is for the old version. [Go to the latest Graphics Mill docs](https://www.graphicsmill.com/docs/gm/)
# IVObjectHost Members
The [IVObjectHost](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_WinControls_IVObjectHost.htm.md) type exposes the following members.
## Methods
| | Name | Description |
| --- | --- | --- |
|  | [ClearHistory](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_IStateNavigable_ClearHistory.htm.md) | Discards both undo and redo history.
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [ClearRedoHistory](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_IStateNavigable_ClearRedoHistory.htm.md) | Discards redo history.
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [ClearUndoHistory](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_IStateNavigable_ClearUndoHistory.htm.md) | Discards undo history.
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [Redo](https://www.graphicsmill.com/docs/gm5/O_T_Aurigma_GraphicsMill_WinControls_IVObjectHost_Redo.htm.md) | Overloaded.
Redoes last undone change. |
|  | [RenderWorkspace](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_WinControls_IVObjectHost_RenderWorkspace_1_7a94462e.htm.md) | Renders all v-object in the workspace into a raster image with the specified resolution. |
|  | [SaveState](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_IStateNavigable_SaveState.htm.md) | Saves state of the object.
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [Undo](https://www.graphicsmill.com/docs/gm5/O_T_Aurigma_GraphicsMill_WinControls_IVObjectHost_Undo.htm.md) | Overloaded.
Undoes last made change. |
## Properties
| | Name | Description |
| --- | --- | --- |
|  | [CanRedo](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_IStateNavigable_CanRedo.htm.md) | Indicates if last reverted action can be redone.
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [CanUndo](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_IStateNavigable_CanUndo.htm.md) | Indicates if last change can be undone.
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [CurrentDesigner](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_IVObjectHost_CurrentDesigner.htm.md) | Gets/sets the currently active designer. |
|  | [CurrentLayer](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_IVObjectHost_CurrentLayer.htm.md) | Gets/sets the currently selected layer. |
|  | [CurrentLayerIndex](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_IVObjectHost_CurrentLayerIndex.htm.md) | Gets/sets the index of the currently selected layer. |
|  | [DefaultDesigner](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_IVObjectHost_DefaultDesigner.htm.md) | Gets the default designer associated with the host object. |
|  | [DesignerOptions](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_IVObjectHost_DesignerOptions.htm.md) | Gets options available to all designers. |
|  | [HostViewer](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_IVObjectHost_HostViewer.htm.md) | Gets a reference to a currently used viewer control. |
|  | [Layers](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_IVObjectHost_Layers.htm.md) | Returns the layer collection of an object. |
|  | [MaxUndoStepCount](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_IStateNavigable_MaxUndoStepCount.htm.md) | Gets/sets maximum number of available undo steps (levels).
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [RedoStepCount](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_IStateNavigable_RedoStepCount.htm.md) | Returns number of available redo levels (i.e. how much time method [Redo()](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_IStateNavigable_Redo.htm.md) can be called).
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [UndoRedoEnabled](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_IStateNavigable_UndoRedoEnabled.htm.md) | Enables or disables undo/redo functionality.
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [UndoRedoTrackingEnabled](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_IStateNavigable_UndoRedoTrackingEnabled.htm.md) | Enables or disables the automatic change tracking.
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [UndoStepCount](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_IStateNavigable_UndoStepCount.htm.md) | Returns number of available undo levels (i.e. how much time method [Undo()](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_IStateNavigable_Undo.htm.md) can be called).
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
## Events
| | Name | Description |
| --- | --- | --- |
|  | [CurrentLayerChanged](https://www.graphicsmill.com/docs/gm5/E_Aurigma_GraphicsMill_WinControls_IVObjectHost_CurrentLayerChanged.htm.md) | Raised when another layer is selected by the user. |
|  | [DesignerChanged](https://www.graphicsmill.com/docs/gm5/E_Aurigma_GraphicsMill_WinControls_IVObjectHost_DesignerChanged.htm.md) | Raised when another v-object is selected by the user. |
|  | [Redoing](https://www.graphicsmill.com/docs/gm5/E_Aurigma_GraphicsMill_IStateNavigable_Redoing.htm.md) | Fires when image is being redone (before starting).
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [Redone](https://www.graphicsmill.com/docs/gm5/E_Aurigma_GraphicsMill_IStateNavigable_Redone.htm.md) | Fires when operation has been redone (after finishing).
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [Undoing](https://www.graphicsmill.com/docs/gm5/E_Aurigma_GraphicsMill_IStateNavigable_Undoing.htm.md) | Fires when image is being undone (before starting).
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
|  | [Undone](https://www.graphicsmill.com/docs/gm5/E_Aurigma_GraphicsMill_IStateNavigable_Undone.htm.md) | Fires when operation has been undone (after finishing).
(Inherited from [IStateNavigable](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_IStateNavigable.htm.md).) |
## See Also
### Reference
- [IVObjectHost Interface](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_WinControls_IVObjectHost.htm.md)
- [Aurigma.GraphicsMill.WinControls Namespace](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill_WinControls.htm.md)