when you drawed a shape,you can control it whether it can change its size or rotate position.in inspector,ResizeEnable can control its size,when set this property as false,it can not change size by mouse.RotateEnable is false, can not rotate it by mouse.

Also,you can set this property value in code.

Code example:

procedure TMainFrm.Button1Click(Sender: TObject); 
begin 
  MyCAD1.RotateEnable:=false; 
  MyCAD1.ResizeEnable:=false; 
  //... 
end;