使い方:

<Page.Resources>
<conv:EqualsToVisibilityConverter x:Key="EqualsThenVisible" />
<conv:EqualsToVisibilityConverter
x:Key="EqualsThenCollapsed"
TrueThen="Collapsed"
FalseThen="Visible" />
</Page.Resources>

<TextBox Visibility="{Binding ControlType, Converter={StaticResource EqualsThenVisible}, ConverterParameter={x:Bind namespace:ControlType.Text}}" />
<ComboBox Visibility="{Binding ControlType, Converter={StaticResource EqualsThenVisible}, ConverterParameter={x:Bind namespace:ControlType.Select}}" />