GroupBox and OptionButtons SpreadsheetGear API Sample

// Create a new workbook and some local variables.
SpreadsheetGear.IWorkbook workbook = SpreadsheetGear.Factory.GetWorkbook();
SpreadsheetGear.IWorksheet worksheet = workbook.ActiveWorksheet;
SpreadsheetGear.IWorksheetWindowInfo windowInfo = worksheet.WindowInfo;
SpreadsheetGear.IRange cells = worksheet.Cells;
double left, top, width, height;

// We will add an Option Button to each cell in this range.
SpreadsheetGear.IRange optionsRange = cells["B3:B7"];
optionsRange.ColumnWidth = 15;

// Setup GroupBox
{
    // Setup another IRange representing the boundaries of a GroupBox, which will 
    // contain all of the Option Buttons.
    SpreadsheetGear.IRange groupBoxRange = optionsRange[
        -1, 0,   // Expand range up one row.
        optionsRange.RowCount, 0   // Expand range down one row.
    ];

    // Use the RowToPoints(...) and ColumnToPoints(...) methods to get to top-left
    // coordinates (relative to the top-left edge of the worksheet) of the beginning
    // of the range (i.e., the top-left edge of cell B2).
    left = windowInfo.ColumnToPoints(groupBoxRange.Column);
    top = windowInfo.RowToPoints(groupBoxRange.Row);
    width = groupBoxRange.Width;
    height = groupBoxRange.Height;

    // Create the GroupBox shape with the above-calculated position and dimensions.
    SpreadsheetGear.Shapes.IShape groupBoxShape = worksheet.Shapes.AddFormControl(
        SpreadsheetGear.Shapes.FormControlType.GroupBox, left, top, width, height);

    // Set the GroupBox header text.
    groupBoxShape.TextFrame.Characters.Text = "My Group Box";
}

// Add individual OptionButtons.  Iterate through each cell in optionsRange.
for (int i = 0; i < optionsRange.RowCount; i++)
{
    // Get reference to desired cell.
    SpreadsheetGear.IRange cell = optionsRange[i, 0];

    // Calculate coordinates and dimensions of OptionButton.
    left = windowInfo.ColumnToPoints(cell.Column) + 10; // Add a little padding
    top = windowInfo.RowToPoints(cell.Row);
    width = cell.Width - 10;    // Offset padding from "left"
    height = cell.Height;

    // Add OptionButton and set its label text.
    SpreadsheetGear.Shapes.IShape optionShape = worksheet.Shapes.AddFormControl(
        SpreadsheetGear.Shapes.FormControlType.OptionButton, left, top, width, height);
    optionShape.TextFrame.Characters.Text = $"My Option {i + 1}";

    // If this is the first OptionButton added, link it to a cell.  All other
    // OptionButtons added to this GroupBox will also be linked to this cell.
    if (i == 0)
    {
        SpreadsheetGear.Shapes.IControlFormat optionControl = optionShape.ControlFormat;
        optionControl.LinkedCell = "A1";
    }
}

// Set the linked cell's value to a valid index of an OptionButton.  Note that 
// OptionButton indexes are 1-based.  This will select the 3rd OptionBox.
cells["A1"].Value = 3;