KnockoutJS binding when source is null/undefined

Answer 1

The "With" works (probably the others works too...)

But with the "With" the role UI disappear/appear even if there are conditions inside... For Example... I need to set a Status (true/false) button, but only if the Status isn't null...

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This works. In this case.

But sometimes just the "With" works like Simon_Weaver said!