https://docs.textcontrol.com/spell/wpf/ref.txtextcontrol.wpf.proofing.suggestiondictionarycombobox.suggestiondictionary.property.htm
TXTextControl.WPF.Proofing.SuggestionDictionaryComboBox.SuggestionDictionary Property - TX Spell...
Gets or sets the dictionary that is currently selected as a suggestion dictionary. If the IsAllItemSelected property is set to true, the value is null.
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