Set keyboard focus to nsDialogs radio button

[ChocJunkie]

Hi,

Is it possible to set the kayboad focus to a nsDialogs radio button?
I've tried:

code:
SendMessage $HWNDPARENT ${WM_NEXTDLGCTL} $0 1 $R0

In this case '$0' is the HWND that has been returned by '${NSD_CreateRadioButton}'.
The installer crashes every time I'm trying this.
When setting the keyboard focus to a button, it works fine.

Thanks.

CJ