The mistery of radio control

[Terenz]

Hello,

I have test this on two OS with different architecture and i can't exaplain the reason:

#include <ButtonConstants.au3>
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>

$Form1 = GUICreate("Form1", 287, 148, -1, -1)
$Radio1 = GUICtrlCreateRadio("Radio1", 16, 16, 113, 17)
$Radio2 = GUICtrlCreateRadio("Radio2", 16, 48, 113, 17)
$Button1 = GUICtrlCreateButton("Button1", 96, 96, 75, 25)
GUISetState(@SW_SHOW)

While 1
    $nMsg = GUIGetMsg()
    Switch $nMsg
        Case $GUI_EVENT_CLOSE
            Exit

    EndSwitch
WEnd

I'm using TAB very often for switch between control. For an unknow reason in the example i have posted tabbing goes to Button to the first Radio and from the first Radio to Button ignoring the second radio control! I have try with

2 combobox, the switch work

1 radio and 1 combobox,  the switch work

With 2 radio i have that issue, the code is so simple that is impossible i have make a mistake. I don't know if is an autoit bug ( oh no i have say that word ) or a strange Windows behavior since i can't find nothing about this.

Edited October 9, 2016 by Terenz

[AutoBert]

That's normal radio behaviour. For going to radio in same group you have to use mouse or cursordown. This behaviour is needed as a radio which get focus toggle it's state to checked.

[Terenz]

Found the answer:

The window is a control that can receive the keyboard focus when the user presses the TAB key. Pressing the TAB key changes the keyboard focus to the next control with the WS_TABSTOP style.

The window is the first control of a group of controls. The group consists of this first control and all controls defined after it, up to the next control with the WS_GROUP style. The first control in each group usually has the WS_TABSTOP style so that the user can move from group to Group

Autoit assing the first checkbox created on the list the WS_TABSTOP style so the other ones are considered in the same group.