In my application I have some link buttons there but when I right click on them I cannot (they are in disable mode) find the menu items Open in new tab
or
Try to find out ID of your form element in generated aspx, and you can change target like...
getElementByID('theForm').target = '_blank' or 'myNewWindow'
try by Adding following onClientClick event.
OnClientClick="aspnetForm.target ='_blank';"
so on click it will call Javascript function an will open respective link in News tab.
<asp:LinkButton id="lbnkVidTtile1" OnClientClick="aspnetForm.target ='_blank';" runat="Server" CssClass="bodytext" Text='<%# Eval("newvideotitle") %>' />