CA-231500: XenCenter allows you to open multiple windows from change role button
CA-231500: XenCenter allows you to open multiple windows from change role button

Show the "Change role" dialog as modal. This way we avoid other issues, like removing the user while the "Change role" dialog is open.

Signed-off-by: Mihaela Stoica <be95049f8e30d921fc7e2579c00c48bd84c40606@citrix.com>

stephen-turner/xenadmin,minli1/xenadmin,MihaelaStoica/xenadmin,xenserver/xenadmin,minli1/xenadmin,geosharath/xenadmin,huizh/xenadmin,kc284/xenadmin,ushamandya/xenadmin,letsboogey/xenadmin,GaborApatiNagy/xenadmin,geosharath/xenadmin,kc284/xenadmin,jijiang/xenadmin,MihaelaStoica/xenadmin,minli1/xenadmin,ushamandya/xenadmin,stephen-turner/xenadmin,GaborApatiNagy/xenadmin,stephen-turner/xenadmin,minli1/xenadmin,ushamandya/xenadmin,stephen-turner/xenadmin,huizh/xenadmin,huizh/xenadmin,ushamandya/xenadmin,stephen-turner/xenadmin,jijiang/xenadmin,jijiang/xenadmin,letsboogey/xenadmin,GaborApatiNagy/xenadmin,minli1/xenadmin,GaborApatiNagy/xenadmin,jijiang/xenadmin,letsboogey/xenadmin,xenserver/xenadmin,huizh/xenadmin,xenserver/xenadmin,jijiang/xenadmin,geosharath/xenadmin,jijiang/xenadmin,stephen-turner/xenadmin,MihaelaStoica/xenadmin,MihaelaStoica/xenadmin,MihaelaStoica/xenadmin,MihaelaStoica/xenadmin,letsboogey/xenadmin,kc284/xenadmin,huizh/xenadmin,letsboogey/xenadmin,GaborApatiNagy/xenadmin,kc284/xenadmin,ushamandya/xenadmin,geosharath/xenadmin,ushamandya/xenadmin,huizh/xenadmin,kc284/xenadmin,letsboogey/xenadmin,geosharath/xenadmin,GaborApatiNagy/xenadmin,geosharath/xenadmin,minli1/xenadmin