Editing a .WFM file
As you become more proficient in dBL, you will find that it is sometimes more convenient to edit a form directly in source code without opening the form in the Form designer. To edit the form file directly, right-click the .WFM file in the Project Explorer or Navigator and choose Open In Source Editor. This will open the .WFM file in the built-in Source editor or another programmer’s editor you specified in the Desktop Properties dialog box.
One advantage to using the built-in Source editor is that you can run the .WFM file directly by pressing Ctrl+D. No matter which editor you choose, you must save and close the .WFM file if you want to edit the form in the Form designer.
When editing the .WFM file directly, you want to preserve the two-way nature of the Form designer so that any changes you make manually will not be lost the next time you save the form from the Form designer.