I use 8 desktops with Kubuntu. I opened the Steam window to a different desktop that I would normally use it in. However right clicking on the window title, which should open a menu with 'To Desktop' entry, does not work with Steam window.

Processor Information:
    Vendor:  GenuineIntel
    Speed: 2501 Mhz
    2 logical processors
    2 physical processors
    HyperThreading:  Unsupported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Unsupported
    SSE41:  Supported
    SSE42:  Unsupported

Network Information:
    Network Speed:  

Operating System Version:
    Ubuntu 12.04.1 LTS (32 bit)
    Kernel Name:  Linux
    Kernel Version:  3.2.0-35-generic-pae
    X Server vendor:  The X.Org Foundation
    X Server release:  11103000

Video Card:
    Driver:  X.Org Gallium 0.4 on AMD RV630

    Driver Version:  2.1 Mesa 8.0.4
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x1002
    DeviceID:  0x9581
    Number of Monitors:  1
    Number of Logical Video Cards:  1
    Primary Display Resolution:  1680 x 1050
    Desktop Resolution: 1680 x 1050
    Primary Display Size: 13.03" x 8.15"  (15.35" diag)
                                            33.1cm x 20.7cm  (39.0cm diag)
    Primary VRAM Not Detected

Sound card:
    Audio device: Analog Devices AD1981

Memory:
    RAM:  3961 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_US.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  140161 Mb
    Largest Free Hard Disk Block:  780 Mb

Installed software:

Recent Failure Reports: