<Grid>
<ComboBox Style="{DynamicResource ComboBoxStyle1}" Height="50" Width="300" Margin="268,41,491,286">
<ComboBoxItem>Тест 1</ComboBoxItem>
<ComboBoxItem>Тест 2</ComboBoxItem>
<ComboBoxItem>Тест 3</ComboBoxItem>
</ComboBox>
</Grid