gksu replacement

In the old days of CentOS 5, I had an application that ran as another user.  I created a .desktop file which ran a command that looked like this: gksu -u anotheruser someapplication When the user clicked the icon, a popup asked for the password of "anotheruser".  When the password was correct, "someapplication" started. Now in the modern days of CentOS 7, I can't find a replacement for this behaviour.  I tried beesu: beesu -l -P someapplication anotheruser but it is asking me for the root password instead of "anotheruser" password. I also tried pkexec: pkexec --user anotheruser someapplication with the same result. Both methods also have problems finding the correct display variable: Failed to parse arguments: Cannot open display: Any help will be appreciated.