Call Dialog form a Dialog in Orbeon 4.x: level="modal" doesn't work correctly.

Hello,

I'm using 4.0.1 and have issue about "level" property of xxf:dialog.

I have two xxf:dialog elements that all have level="modal" properties.

When I open the second dialogbox from the first dialogbox at the first time, the first dialogbox in background is still available. Then if I close the second dialogbox and open it again, this time the first dialogbox reacts correctly and it's not available any more.

Here are the source codes:dialog_my.xhtml 

Has that problem been fixed in 4.2? Thanks!