grid header visible even if column is hidden

<grid hflex="true">
	<columns menupopup="auto">
		<column hflex="1" label="A" />
		<column width="30em" label="B" />
		<column hflex="2" label="C" />
		<column hflex="3" label="D" />
	</columns>
	<rows>
		<row>
			<label value="A" />
			<label value="B" />
			<label value="C" />
			<label value="D" />
		</row>
	</rows>
</grid>