Hi Georgios,
I will re-open ticket 207 so you can provide us with a reproducible test case. That way we can look into it further.
Just as a comment, we have tested this case on the following PowerBuilder versions: 10.5.2, 11.0, 12.5, 12.6, 2017 and 2017 R2 and all of these versions behave the same way. When a window's visible property is set to false, then the lasso selection of objects is not available. You can select them individually or by pressing CTRL and selecting them one by one. But the lasso is disabled in a windows marked as not visible.
The only way to do this is by selecting the "Show Invisibles" in the Design menu of the IDE.
Regards,
Just opened a PB12.5.2.5006
I have MENU - DESIGN - "Show invisbles" Checked
I open a window the has property "Visible" unchecked.
On this window i can do a "lasso" select of object (both visible an nonvisible object) - I can't see the "lasso" but it sure selects the object. (i also tried a userobject and have the same behavior)
So according to your previous post - this should be a bug - or ?
Regards
Georgios