Gets the array of FeatureControlFrameAdditionalSymbolsEnum indicating the additional symbols to be made available in the feature control frame creation and edit dialog.
| Name | Type | Description |
| AvailaleAdditionalSymbols | FeatureControlFrameAdditionalSymbolsEnum | Output array of FeatureControlFrameAdditionalSymbolsEnum indicating the additional symbols to be made available in the feature control frame creation and edit dialog. |