// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET
// Accessing the worksheet of the Grid that is currently active
Worksheet sheet = gridDesktop1.GetActiveWorksheet();

// Accessing the location of the cell that is currently in focus
CellLocation cl = sheet.GetFocusedCellLocation();

// Adding checkbox to the Controls collection of the Worksheet
sheet.Controls.AddCheckBox(cl.Row, cl.Column, true);