Steps to Reproduce

<combobutton label="400px" width="400px"/>
<combobutton label="hflex" hflex="1"/>

Actual Result

the span.z-combobutton-content is rendered (as inline-block) to just fit around its label even if the surrounding span.z-combobutton is correctly sized to 400px / flex size

Expected Result

button using up the defined width: 400px /flex width

Workaround

adding either of the below style rules will stretch the span.z-combobutton-content into the available space:

.z-combobutton-content {
	width: 100%;
}

OR

.z-combobutton-content {
	display: block;
}