#317 Dialog label parameter allowfocus doesn't accept value 1

[Miro Halas]

This was reproduced with Patterns test dialogtabtest4.
The dialog:label custom tab had parameter allowfocus
that allows to specify that user can tab to the field
label. The test has two field labels that allow it. The
First field uses allowfocus="true" and it works just
fine. The Fourth field uses uses allowfocus="1" and it
doesn't work. If I change it to allowfocus="true" it
works again. This needs to be fixed so that both values
"true" and "1" are supported. Is this but affecting
other parameters as well?