I have grid with first column hflex="min", and it ok, column has min (by content) size
<grid vflex="min" hflex="true">
<columns>
<column hflex="min"/>
<column hflex="true"/>
</columns>
<rows>
<row>
<label value="Глобальный ID"/>
<textbox id="globalId" readonly="true" hflex="true"/>
</row>
<row>
<label value="Локальный ID"/>
<textbox id="localId" readonly="true" hflex="true"/>
</row>

</rows>
</grid>

If i add another row with spans="2" then first colum not has min size

<row spans="2">
<hlayout>
<checkbox id="chkHomeComplex" disabled="true" label="Домашний комплекс"/>
<checkbox id="chkNearComplex" disabled="true" label="Соседний домашнему комплексу"/>
<checkbox id="chkSecret" disabled="true" label="Комплекс закрытого контура"/>
<checkbox id="chkArchive" disabled="true" label="Архивный"/>
</hlayout>
</row>

I think first column must be minimum size.