ng2-pdfjs-viewer how to open pdf in external Window on every new document?

i"m using ng2-pdfjs-viewer package to view pdf files, i want to open pdf viewer in external Window, but every time it's overwrite the same pdf viewer browser tab ... how i can open every document in new tab?

html:

<ng2-pdfjs-viewer #externalPdfViewer
[externalWindow]="true" [openFile]="true" [viewBookmark]="false"
[download]="true" [downloadFileName]="downloadFileName"
[showSpinner]="true" target="_blank">
</ng2-pdfjs-viewer>


ts:

@ViewChild('externalPdfViewer') public externalPdfViewer;

this.externalPdfViewer.pdfSrc = this.pdfSrc;
this.externalPdfViewer.refresh();

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