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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