When using the DropDownChoiceField of Microsoft Office SharePoint Server, always make sure that the field it references is required = true (see description below). If that is not the case, the dropdown control will not be rendered on the user interface.
<SharePointWebControls:DropDownChoiceField
FieldName="NewsCategory"
runat="server"
id="DropDownChoiceField1" />
<Field ID="{EEF88D9A-503D-40E4-AAA5-85117608B4B4}"
Name="NewsCategory" StaticName="NewsCategory"
Type="Choice"
Format="Dropdown"
Required="TRUE"
... />
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