hey ppl n hi peter! at last, found a way out.

Range r = Connect.myApplication.ActiveCell;
Microsoft.Office.Interop.Excel.Worksheet theSheet =
(Microsoft.Office.Interop.Excel.Worksheet)Connect. myApplication.Worksheets.get_Item(1);
theSheet.Shapes.AddOLEObject("Forms.CommandButton. 1",
Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
"click_me", theSheet.get_Range(r, r).Left,theSheet.get_Range(r,
r).Top, theSheet.get_Range(r,
r).Width, theSheet.get_Range(r, r).Height);


Requires you to add MSForms 2.0, your addin should have a reference to
MSForms object library and use as MSForms.CommandButton.