Commented Issue: HtmlEditorExtender: BackColor and ForeColor buttons is not working [27892]

HtmlEditorExtender throws an exception when trying to change background or foreground colors. See how it [looks like](http://screencast.com/t/caR0xaAWzE17).

It can throw two different type of errors. The first one:
```
Uncaught IndexSizeError: Failed to execute 'getRangeAt' on 'Selection': 0 is not a valid index.
```
The second one:
```
Uncaught Sys.InvalidOperationException: Sys.InvalidOperationException: 'unselectable' is not a property or an existing field.
```
See attached screenshots.
Comments: What's the resolution for this? I'm experiencing the exact same error when I try to click the foreground or background color buttons. The error I am getting is: Sys.InvalidOperationException: 'unselectable' is not a property or an existing field. Call stack is: > Sys$Component$_setProperties [ScriptResource.axd] Line 3747 Script Sys$Component$create [ScriptResource.axd] Line 3816 Script Sys.Extended.UI.HtmlEditorExtenderBehavior.prototype._executeCommand [ScriptResource.axd] Line 836 Script Anonymous function [ScriptResource.axd] Line 47 Script browserHandler [ScriptResource.axd] Line 4052 Script