GirdItem width

[mark goldin]

I am using GridItem to create a number of rows with columns with equal
width.

Here is my code:
<mx:GridItem borderStyle="none" horizontalAlign="left">
<mx:Label text="Label1"/>
</mx:GridItem>
<mx:GridItem borderStyle="none" horizontalAlign="left">
<mx:ComboBox labelField="Value"
</mx:ComboBox>
</mx:GridItem>

There is a large gap between a label and a combo. How can I adjust it?

Thanks