te Excecute methot within the CustomTool API is not valid for an customExportTool (even if this inherits it). therefore there is no public method to be called from IronPython in order to trigger a custom export from a button for example. Furthermore the method ExecuteCore in a custom Export Tool takes along with the context an object called ËxportResult" as argument. This object has no public constructor and thereore cannot be instantiated from a custom code like IronPython.