in collection bool values display good icons when not toggable:
null as icon-question-sign
1 as icon-ok
0 as icon-cancel

in collection with toggable button,
null displays as icon-cancel,

I would like to have null as undefined (question mark).
is it here: administrator\components\com_obrady\dom\html\fly\bool.php
?
cant find the right place in code.

This is handled by JDom.
Correct, when you choose togglable, the icons differs. Maybe not the best. Might be unified at least.

The JDom class handling that is :
html.grid.bool.default

located in :
EDIT: You might find easily how to change the icons.
Hope it helps.

thx for replay,
if someone would like not to have "undefined" option
than would simply specify the default value as "false" or "true" in the builder.

I ve been changingand:
the the code there doesn't seem to influence the behavior of buttons...
did i miss something?

Sorry I was wrong.is deprecated

When I opened those files again, I saw a big mess. So I rewritten that part.
github.com/Cook-Self-Service/JDom/commit...fd143bc25f13ad9bce8e
You need the last JDom version 2.6.14, included naturally when you download again (no need to do anything). JDom will be automatically updated at install.

It is now much easy to change the icons. You have to edit the file :
You will find the icons at the top of the file.
JDom calls does not change at all in your code.
You still can use html.grid.bool which is an alias of html.grid.task.state.bool

Hope it helps.

Thx Jocelyn
now it works out of the box
I don't have to fork anything!