Onclick handlers get "x-" prefix from WinJS

We are currently connecting a cordova app developed with AngularJS from Android / iOS to Windows. It is built as a universal application and therefore runs in the WinJS environment.

Now we have a problem that we are setting the dynamic onclick-Attribute in special cases (where we cannot use ng-click), but the attribute is prefixed with "x-" during WinJS runtime (at least I am so I think). Is there a way to suppress this behavior?

Best wishes and thanks for your help.