FarPoint.Win.Spread.CellType.RichTextCellType rtf = new FarPoint.Win.Spread.CellType.RichTextCellType();
rtf.BackgroundImage = new FarPoint.Win.Picture(Image.FromFile("c:\\fplogosm.bmp"));
bool b;
rtf.Static = false;
fpSpread1.ActiveSheet.Cells[0, 0].CellType = rtf;
fpSpread1.ActiveSheet.Cells[0, 0].Text = @"{\\rtf1\\ansi\\ansicpg1252\\deff0\\deflang1033{\\fonttbl{\\f0\\fswiss\\fcharset0Arial;}}{\\colortbl ;\\red255\\green0\\blue0;\\red255\\green0\\blue255;\\red128\\green0\\blue0;\\red0\\green0\\blue0;}{\\*\\generator
Msftedit 5.41.15.1507;}\\viewkind4\\uc1\\pard\\cf1\\f0\\fs20 This \\cf2 is \\cf3 RTF \\cf4\\b Test.\\cf0\\b0\\par}";
b = rtf.IsFormulaValue;
MessageBox.Show(b.ToString());
Dim rtf As New FarPoint.Win.Spread.CellType.RichTextCellType
rtf.BackgroundImage = New FarPoint.Win.Picture(Image.FromFile("c:\fplogosm.bmp"))
Dim b As Boolean
rtf.Static = False
FpSpread1.ActiveSheet.Cells(0, 0).CellType = rtf
FpSpread1.ActiveSheet.Cells(0, 0).Text = "{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss\fcharset0 Arial;}}{\colortbl
;\red255\green0\blue0;\red255\green0\blue255;\red128\green0\blue0;\red0\green0\blue0;}{\*\generator Msftedit 5.41.15.1507;}\viewkind4\uc1\pard\cf1\f0\fs20
This \cf2 is \cf3 RTF \cf4\b Test.\cf0\b0\par}"
b = rtf.IsFormulaValue
MessageBox.Show(b.ToString())