Add below code to your resources or the style page.
<:Style x:Key="GlassBorderStyle" TargetType="Border">:
<:Setter Property="BorderThickness" Value="2"/>:
<:Setter Property="Padding" Value="5"/>:
<:Setter Property="Background">:
<:Setter.Value>:
<:LinearGradientBrush EndPoint="0.75,1" StartPoint="0.25,0">:
<:GradientStop Color="#33FFFFFF" Offset="0"/>:
<:GradientStop Color="#C0FFFFFF" Offset="0.287"/>:
<:GradientStop Color="#4011322D" Offset="0.683"/>:
<:GradientStop Color="#33FFFFFF" Offset="1"/>:
<:/LinearGradientBrush>:
<:/Setter.Value>:
<:/Setter>:
<:Setter Property="BorderBrush">:
<:Setter.Value>:
<:LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">:
<:GradientStop Color="#5811322D" Offset="0"/>:
<:GradientStop Color="#3EFFFFFF" Offset="0.25"/>:
<:GradientStop Color="#FFFFFFFF" Offset="0.5"/>:
<:GradientStop Color="#3EFFFFFF" Offset="0.75"/>:
<:GradientStop Color="#BFFFFFFF" Offset="1"/>:
<:/LinearGradientBrush>:
<:/Setter.Value>:
<:/Setter>:
<:Setter Property="Effect">:
<:Setter.Value>:
<:DropShadowEffect BlurRadius="3" ShadowDepth="3" Opacity="0.5"/>:
<:/Setter.Value>:
<:/Setter>:
<:/Style>:
now create a button and apply the resource of that Glass Border.
<:Border x:Name="GlassBorder" Height="100" Width="250" CornerRadius="10" Style="{StaticResource GlassBorderStyle}">:
<:Button Content="Glass Border Style"/>:
<:/Border>: