To draw a Dotted line:
1. Double click the Line tool from the toolbox. A Custom Stroke dialogue box appears.
2. Select the required Stroke style in the dropdown list box.
3. Then click OK button. Now the cursor changes to a cross hair.
4. Click and drag on the screen to draw your dotted line. As you drag, the line appears.
5. Release the mouse button and the line will be drawn and selected, with sizing handles on either end. Resize the line by clicking and dragging the handles, if necessary.