---
title: "CanvasViewer..::.lockViewer Method "
canonical: https://www.graphicsmill.com/docs/gm5/M_J_Aurigma_GraphicsMill_AjaxControls_CanvasViewer_lockViewer.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/)

# CanvasViewer.lockViewer Method 
 
Shows a semi-transparent rectangle over the [CanvasViewer](https://www.graphicsmill.com/docs/gm5/T_J_Aurigma_GraphicsMill_AjaxControls_CanvasViewer.htm.md).
 
**Namespace:** [Aurigma.GraphicsMill.AjaxControls](https://www.graphicsmill.com/docs/gm5/N_J_Aurigma_GraphicsMill_AjaxControls.htm.md)
 **Assembly:** Aurigma.GraphicsMill.AjaxControls.VectorObjects (in Aurigma.GraphicsMill.AjaxControls.dll)
 
## Syntax
  
```
function lockViewer();
```
 
## Remarks
  
To hide this rectangle use the [unlockViewer()](https://www.graphicsmill.com/docs/gm5/M_J_Aurigma_GraphicsMill_AjaxControls_CanvasViewer_unlockViewer.htm.md) method.
   
## See Also

### Reference

- [CanvasViewer Class](https://www.graphicsmill.com/docs/gm5/T_J_Aurigma_GraphicsMill_AjaxControls_CanvasViewer.htm.md)
- [Aurigma.GraphicsMill.AjaxControls Namespace](https://www.graphicsmill.com/docs/gm5/N_J_Aurigma_GraphicsMill_AjaxControls.htm.md)