wep key lost

["aj2r ya com " <aj2r ya com>]

My problem is that I type correctly wep key but networkmanager
doesn't configure interface with the key:
------
wlan0     IEEE 802.11g  ESSID:"Router"  Nickname:"eclipse"
          Mode:Managed  Frequency:2.437 GHz  Access Point:
00:0E:6A:C8:21:4E
          Bit Rate=54 Mb/s   Tx-Power:24 dBm
          RTS thr=2347 B   Fragment thr=2346 B
          Encryption key:off
          Power Management:off
          Link Quality:100/100  Signal level:-53 dBm  Noise
level:-256 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0
--------

because it doesn't connect.

I 've changed code:
---------
./src/nm-device-802-11-wireless.c

line 2291

   if (!nm_utils_supplicant_request_with_check (ctrl, "OK",
__func__, NULL,
-         "INTERFACE_ADD %s\t\tndiswrapper\t"
WPA_SUPPLICANT_CONTROL_SOCKET "\t", iface)) {
+         "INTERFACE_ADD %s\t\tndiswrapper\t"
WPA_SUPPLICANT_CONTROL_SOCKET "\t", iface)) {
------------

Now networkmanager connect!! But in few seconds it lost key.