[SOLVED]isChecked (select, checked resource) how to use?

[Huntenkill]

I've made a resource as above into the project. in VB.net I used the option IsChecked but it doesn't work for me.
How can I check if for example Common is checked, or Uncommon is checked?

Already tried making a Var name Common and trying [[ChooseRarity]] = [[Common]] but in both cases ( equals and equals not they're true).

Please explain on how to use this one.

[SOLVED] See comment below. Thanks @Fox

[Fox]

@Huntenkill

{{IsChecked}}.indexOf("Uncommon") >= 0

Test script

[Huntenkill]

Thank you @Fox

Marked as solved and Credits in the topic :)