In Visual Studio 2015, specifically in a wpf application, when creating a style in windows.resoures
like this:
<Window.Resources>
<Style x:Key="DetailTextStyle" TargetType="TextBlock">
<Setter Property="Foreground" Value="Blue"/>
</Style>
</Window.Resources>
The value of the foreground can be edited by double clicking it in properties.(image link has been attached. plz check). But after reinstalling Visual Studio I cannot double click and select color. I am able to do this on my laptop with same installation.
Try to add a brush resource and use it in your value field, try this code:
<Window.Resources>
<SolidColorBrush x:Key="TestBrush" Color="Blue"/>
<Style x:Key="DetailTextStyle" TargetType="{x:Type TextBlock}">
<Setter Property="Foreground" Value="{StaticResource TestBrush}"/>
</Style>
</Window.Resources>
instead of double click do right click and pick "Edit Resource"