fix

[kayoubi]

the import was wrong and I had to remove the other two lines, otherwise I get registerHandler is not defined and unregisterHandler is not defined respectively

it seems to work fine now

[codeNgamer]

@kayoubi why did you remove lines:

+   this.props.navigationStateHandler[registerHandler](this);
+   this.props.navigationStateHandler[unregisterHandler](this);

registerHandler and unregisterHandler are placeholders in this context meaning you can swap them out for methods like:

+   this.props.navigationStateHandler.registerRefreshHandler(this);
+   this.props.navigationStateHandler.unregisterRefreshHandler(this);

navigationStateHandler method = "register" + ActionConst["propertyName"] + "Handler"

or

navigationStateHandler method = "unregister" + ActionConst["propertyName"] + "Handler" 

[kayoubi]

@codeNgamer Ah, I see, just reverted those two lines