How to populate a ComboBox with data from a WebService

I have a simple application that has a DataGrid that gets its
data from a web service. I would prefer to put that data into a
ComboBox instead of a DataGrid. My web service returns objects.
Anyone have any idea how to do that?
<mx:DataGrid id="dgProjects"
dataProvider="{ws.getProjects.lastResult}" >
.....<mx:columns>
..........<mx:DataGridColumn dataField="projectID"
headerText="Project ID" width="100"/>
..........<mx:DataGridColumn headerText="Project Name"
dataField="projectName"/>
..........<mx:DataGridColumn headerText="Doc UNID"
dataField="docUNID" visible="false"/>
.....</mx:columns>
</mx:DataGrid>

I tried that but it doesn't work. However, I just found part
of the solution and that was to add labelField="projectName".
That worked. Now, I want to glue together projectID with
projectName and a dash between them. So I changed it to labelField
= "projectID - ProjectName" and that causes the combo box to
display [Object] [object].
Any ideas how to glue those items together?

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How to populate a ComboBox with data from a WebService

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