The current implementation of API does not provide access to chart mouse events. However, what you can try to do, is adding a chart object from your strategy and depending on users actions with it, applying some strategy business logic, see the following examples:
https://www.dukascopy.com/wiki/index.php ... art_objectand
https://www.dukascopy.com/wiki/index.php ... ect_eventsNote that strategy can only work with its own objects (the ones that it has created).