We have an assembly with
```
public class VoliaMaskedEditExtender : ExtenderControlBase
```
this extender is added to the page and it renders some __WebResource.axd__ url which returns 404.
We would like to get rid of it so I debugged and found that it is added inside __ExtenderControlBase.OnLoad()__
To be more specific within __ToolkitResourceManager.GetStyleNames()__ always added __Background.min.css__ and it is obviously missing in the custom extender assembly
In order to workaround this issue I had to add an embedded resource __Background.min.css__ into the custom extender assembly.
Comments: Merged with [27873](https://ajaxcontroltoolkit.codeplex.com/workitem/27873)
```
public class VoliaMaskedEditExtender : ExtenderControlBase
```
this extender is added to the page and it renders some __WebResource.axd__ url which returns 404.
We would like to get rid of it so I debugged and found that it is added inside __ExtenderControlBase.OnLoad()__
To be more specific within __ToolkitResourceManager.GetStyleNames()__ always added __Background.min.css__ and it is obviously missing in the custom extender assembly
In order to workaround this issue I had to add an embedded resource __Background.min.css__ into the custom extender assembly.
Comments: Merged with [27873](https://ajaxcontroltoolkit.codeplex.com/workitem/27873)