Why my custom form is not blocked by blocking commands such "xsection"?

Hello everyone!

Could somebody help me understand this behaviour?

I've noticed that my form is not blocked by other commands like "xsection"... When I run "xsection" it is a blocking window and nothing else can be done, however, if my form is running it is not blocked by the "xsection" command...

If I run some blocking windows from the skill code such as axlUIConfirm() it works OK and I can not interact with my form until the confirm window is closed.

If I run my form and then open "xsection" I can interact with my form and also I can close it but the rest of allegro is blocked by "xsection" command.

If run my form and then from it run the "xsection" (by adding action to button that will run axlShell( "xsection") ) I can also interact with my form but I can not close it and also if I do some inputs and close the "xsection" all changes I did in my form revert to the state before running "xsection" when the "xsection" window is closed

Any idea where to start? Is this matter of axlFormCreate, or axlUIWSetParent or anything else?

Thanks for advice!

Miro