I am trying to implement an excel document to html iframe and I'm having an issue when trying to navigate the rendered iframe. When I click buttons for the sheets available within the excel file, a new tab is opened every time. I have tried to modify the link_target_type attribute to HtmlLinkTargetType.SELF and PARENT, but this seems to do nothing. When I dig through the html code rendered for the browser, I see that the iframe targets for the file produced are "self". I think it needs to be "_self" in order to work properly. Is there any way a pull request can be created to update this for the aspose.cells software package?