Two open taskpanes side by side
问题 I am making an Office add-in which has two ribbon buttons. Each button is linked to a different TaskpaneId, and clicking on each button opens a different taskpane: <bt:Urls> <bt:Url id="Contoso.Taskpane1.Url" DefaultValue="https://localhost:3000/addin/page1" /> <bt:Url id="Contoso.Taskpane2.Url" DefaultValue="https://localhost:3000/addin/page2" /> </bt:Urls> It seems that I have seen some Office Add-ins where two task panes can be shown side by side simultaneously (I forgot which exactly the