How to draw a GP line on an apron. in ADE
1. Create the apron.
2. Click on the button that has a tooltip saying "Add Custom Ground Line" - it has a picture of a line and a cross with a little "G" underneath it.
3. Draw your line - (left) click, click to create the first segment, click again to create the next segment, etc. Double click the last point to end the line.
4. The GP Line Editor will appear. Set the Line Width.
5. Choose the Main Texture.
6. Select the Line Pattern/Style. If this list is empty, then you have not chosen a Line texture.
7. When you do this, your line will suddenly become a vertical line - that's OK.
8. If you wish your line to have an "edge" on both sides (like a black edging on both sides), set the Backing Width and Select a Backing texture. If not, leave them blank.
9. Click OK.