| Message | Description |
| DE_ADDCONTROL | Adds a control to the editor |
| DE_SETCONTROLINFO | Changes a control's data |
| DE_GETCONTROLINFO | Gets a control's data |
| DE_FINDCONTROL | Finds a control |
| DE_DELETECONTROL | Removes a control |
| DE_GETSELCOUNT | Number of selected controls |
| DE_GETCOUNT | Number of controls |
| DE_GETFOCUSINDEX | Control with focus |
| DE_ALIGNCONTROLS* | Aligns selected controls |
| DE_SIZECONTROLS | Resizes selected controls* |
| DE_SETTEST | Puts editor in test mode |
| DE_GETSEL | Gets selected controls |
| DE_SETGRID | Displays grid |
| DE_GETGRID | Gets grid settings |
| DE_ISGRIDON | Grid visibility state |
| DE_SETSNAPON | Set snap-to-grid |
| DE_ISSNAPON | Snapping state |
| Notes: * indicates feature not implemented in version 1.00 | |