Steps to Reproduce

<combobox type="password"/>

Current Result

type="password" missing on the input element

Expected Result

type="password" on the input element

Debug Info

server side Combobox extends Textbox (providing the setType() method)
client side Combobox only inherits from InputWidget missing the implementation for setType (present at zul.inp.Textbox)

Workaround

add the password type via client side listener:

passwordCombo.setWidgetListener("onBind", "this.getInputNode().type='password';");