How to draw line on SAP form

Hi everyone,

Who have a good way to draw lines on SAP form?

I created a Wizard form, and use Rectangle (Height=0) as the two lines between title and bottom button, but I met a problem, when show another form which cover the line, after close this form, some part of lines disappear, I have tried using SAP form refresh, it still can not restore showing line completely, who have good way to workaround the problem or give me another way to draw line.

Thanks in advance!

Kathy