Hi,
you can change the position of the check mark in the XML source.
The <field> element of your check box contains a <para> element with a vAlign attribute.
This attribute controls the alignment of the checkmark.
Change it into <para vAlign="top"/>.
<field name="CheckBox" y="28.575mm" x="104.775mm" w="43.205mm" h="12.7mm">
<ui>
<checkButton>
<border>
<edge stroke="lowered"/>
<fill/>
</border>
</checkButton>
</ui>
<font typeface="Arial"/>
<margin leftInset="1mm" rightInset="1mm"/>
<!-- Change the vAlign into "top" to display check mark at the top of the field -->
<para vAlign="middle"/>
<value>
<integer>0</integer>
</value>
<caption placement="right" reserve="28.132mm">
<para vAlign="middle"/>
<value>
<text>Line1
Line2</text>
</value>
</caption>
<items>
<integer>1</integer>
<integer>0</integer>
<integer>2</integer>
</items>
</field>
Hope this helps.