IE 6,7&8 Throwing an Error when we open Table Properties dialog

[Satya Minnekanti]

To reproduce the defect:

1. Open CK Editor and insert a Table.

2. Open Context menu in a Table cell & click on Table Properties option to open Table Properties dialog.

Expected Result: Table properties dialog opens up with out any errors.

Actual Result: Table properties dialog opens up but an error appears in status bar and the error is can't move focus to the control because it is invisible,not enabled, or of a type that does not accept the focus

[Jakub Ś]

Reproducible for IE6,7,8 form CKEditor version 3.6 rev [6904]

Error message:
Wiadomość: can't move focus to the control because it is invisible,not enabled, or of a type that does not accept the focus
Line: 1020
URI: /3.6/ckeditor/_source/plugins/dialogui/plugin.js

Wiadomość: can't move focus to the control because it is invisible,not enabled, or of a type that does not accept the focus
Line: 1038
URI: /3.6/ckeditor/_source/plugins/dialogui/plugin.js

[Sa'ar Zac Elias]

Fixed with [6926].