---

<ComboBox Name="Material"
          Grid.Row="0" Grid.Column="0"
          Width="180"
          HorizontalAlignment="Left">

    <ComboBoxItem Content="Сталь"/>
    <ComboBoxItem Content="Нержавеющая сталь"/>
    <ComboBoxItem Content="Алюминий"/>
    <ComboBoxItem Content="Бронза"/>
    <ComboBoxItem Content="Латунь"/>
    <ComboBoxItem Content="Медь"/>
    <ComboBoxItem Content="Титан"/>
    <ComboBoxItem Content="Чугун"/>
    <ComboBoxItem Content="Цинк"/>

</ComboBox>

<ComboBox Name="Mark"
          Grid.Row="1" Grid.Column="0"
          Width="180"
          HorizontalAlignment="Left">

    <ComboBoxItem Content="Ст3"/>
    <ComboBoxItem Content="Ст20"/>
    <ComboBoxItem Content="Ст45"/>
    <ComboBoxItem Content="12Х18Н10Т"/>
    <ComboBoxItem Content="AISI 304"/>
    <ComboBoxItem Content="AISI 316"/>

</ComboBox>