"Based on style" combobox is not filled with all linked and paragraph styles in the following cases:
- "Modify style" dialog doesn't display the possible "based on" styles in the combobox when editing linked styles. 
- "Create new style from formatting" dialog doesn't display the possible "based on" styles in the combo box during creation of new linked style.

Steps to reproduce:

Variant 1:
- Click Home -> Styles -> Change Styles in the ribbon UI.
- Expand the the drop down of Heading 1 button and click 'Modify'
Expected: 'Style based on' combobox contains all paragraph and linked styles.
Actual: 'Style based on' combobox is empty.
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Variant 2:
- Click Home -> Styles -> Change Styles in the ribbon UI.
- Click 'New' button.
- Choose 'Style type:' Linked in the combobox.
Expected: 'Style based on' combobox contains all paragraph and linked styles.
Actual: 'Style based on' combobox is empty.