title: How to make a line straight in StarUML
body: <p>I am using the StarUml to draw some component dialog,however I found that it is to difficult to make a straight line straight enough.</p>
  
  <p>In visio, when I want to draw a Horizontal straight line,I can use the "Shift" key in my keybordl,how to do it in StarUml?</p>