Remarks
The property returns null when the text selection contains multiple characters with mixed colors.
TX Text Control .NET for Windows Forms Reference GuideTXTextControl Namespace InputFormat Class TextBackColor Property
Gets or sets the color used to display the text background color at the current input position. If text is selected, the property specifies the background color of the whole selected text.
public System.Drawing.Color? TextBackColor { get; set; }Public Property TextBackColor() As Nullable(Of System.Drawing.Color)The property returns null when the text selection contains multiple characters with mixed colors.