Gets or sets a value specifying whether there is a frame line at the top of the text. If text is selected, the property specifies this attribute for the whole selected text.
public bool TopFrameLine { get; set; }
Public Property TopFrameLine() Boolean
The following XAML example shows how to bind the Top
<MenuItem
IsCheckable="True"
Header="Top Frame Line"
IsChecked="{Binding ElementName=textControl1, Path=InputFormat.TopFrameLine}" />