[Fix] Expression getValueSelected occurs a bug when comparing.
<font color=red>Be aware that the first line's ID of a comboBox is 1, not 0.</font>
OK, I looked your capx. I don't understand why you compare the getValueSelected without any options added in your comboBox... ? Maybe that's only for the example, but it's a part that occurs the issue.
Firstly, you have to add at least one line.
getValueSelected return the ID of the selected line, BUT, it starts from 1 (not from 0).
So you have to compare with '1' if you want to know if the first line is selected.
Let me know if it solved the bug.