I've spent a number of days researching this particular issue and used many suggested solutions such as '.dispose()' that I thought might work but have not, but nothing specifically addresses this issue that I can find. I thought a 'superuser' may have experienced this issue or similar. I posted an issue on Git-Hub with details on this issue, of what I believe is a bug in the suggestionProvider parameter, not updating the auto-completion box with an updated list. The application using this ControlFX by FXExperience switches between databases, so the resulting JavaFX ComboBox updates with a new list of parameters specific to each database which are also passed to the Textfields.bindAutoCompletion method. Additionally, any time a database is switched, the defect in the suggestionProvider adds the new list to the old list as well.
I've recreated the details below because it has been sometime without no acknowledgement.You can see the issue here if necessary: https://github.com/controlsfx/controlsfx/issues/1126
Before Updating ComboBox And BindAuto Completion: This is data in the ComboBox and AutoComplete before updating Before Updating ComboBox And BindAuto Completion
Combo Set To Null: Topic ComboBox reset to null Combo Set To Null
Passing Null Value Only To ControlFX bindAutoComplete: Passing new values to bindAutoCompletion method Passing Null Value Only To ControlFX bindAutoComplete
No Items In ComboBox: ComboBox dropdown only shows null value item passed No Items In ComboBox
ControlsFX_bindAutoComplete Retains Old List: Controls bindAutoCompletion still retains the old list of items though it was passed updated parameters. ControlsFX_bindAutoComplete Retains Old List