Try put dropdown into a separate group:
<item type="g_start" />
<item type="dropdown" name="FontName" width="95" text="[[FontName]]" command="FontName" />
<item type="dropdown" name="FontSize" width="40" text="[[FontSize]]" command="FontSize" />
<item type="separator" />
<item type="image" name="InsertHorizontalRule" imagename="rule" />
<item type="image" name="InsertLink" imagename="link" />
<item type="image" name="Unlink" />
<item type="g_end" />
Should be:
<item type="g_start" />
<item type="dropdown" name="FontName" width="95" text="[[FontName]]" command="FontName" />
<item type="dropdown" name="FontSize" width="40" text="[[FontSize]]" command="FontSize" />
<item type="g_end" />
<item type="separator" />
<item type="g_start" />
<item type="image" name="InsertHorizontalRule" imagename="rule" />
<item type="image" name="InsertLink" imagename="link" />
<item type="image" name="Unlink" />
<item type="g_end" />
Hope it helps.
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