draggableToMap does not work

[IOZD]

draggableToMap does not work although It is in the demo code:

  <a href="https://github.com/TGFTech/angular-cesium" class="github-link"
            [draggableToMap]="{src: '../assets/GitHub-Mark-Light.png', style: {width: '50px', height: '50px'}}">            
<img class="github" src="../assets/GitHub-Mark-Light.png" >     </a>

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