Changes

<VerticalLayout anchor="top" padding="4,4,4,4" spacing="2" childForceExpandHeight="False" childControlHeight="False">

<VerticalLayout anchor="top" padding="4,4,4,4" spacing="2" childForceExpandHeight="False" childControlHeight="False">

<ContentFitter verticalFit="PreferredSize">

<ContentFitter verticalFit="PreferredSize">

<label id="lab" color="FF0000" height="24">Hello</label>

<Label id="lab" color="FF0000" height="24">Hello</Label>

<button onClick="ShowMessage(Hehe)" height="24">Click me</button>

<Button onClick="ShowMessage(Hehe)" height="24">Click me</Button>

<combo height="24">a,b,c</combo>

<Combo height="24">a,b,c</Combo>

</ContentFitter>

</ContentFitter>

</VerticalLayout>

</VerticalLayout>