Comment 11 for bug 551432

xwininfo shows the window is created but not mapped:

xwininfo: Window id: 0x8e082c6 "Add a Storage Volume"

  Absolute upper-left X: 708
  Absolute upper-left Y: 349
  Relative upper-left X: 708
  Relative upper-left Y: 349
  Width: 500
  Height: 320
  Depth: 24
  Visual: 0x21
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsUnMapped
  Override Redirect State: no
  Corners: +708+349 -712+349 -712-411 +708-411
  -geometry 500x320+708+349