[NETCFGX] Radiobuttons need 2 arrow-down-presses instead of one

Something is wrong with keyboard-interaction with radiobuttons.

Reproduction steps

• open the netcfgx dialog tcp/ip-v4 properties IDD_TCPIP_BASIC_DLG
• the current keyboard focus is on a radiobutton when you open that dlg
• now try to toggle the radio-button with the keyboard arrow keys

Expected result
on 2k3sp2 with the MS netcfgx you can press a single time the arrow-down key to make it untoggle the first radiobutton-choice, and toggle to the second choice
same is true for the arrow-up to untoggle the 2nd choice, and activate the first choice. A single keystroke is enough for that

Observed result
on ros the first arrow-down-pressing will invoke a drawing glitch, and only the 2nd keydown manages to untoggle the first selection and activate the 2nd selection
same is true for arrow-up. It needs a 2nd pressing of the key
0.4.15-dev-6961-g8860dc5_radioButton.webm
0.4.15-dev-6961-g8860dc5_radioButton.log (nothing is logged while toggling the radiobutton)

It affected both radiobuttons in that dialog.
netcfgx dlg resources to blame here according to KRosUser.