| Name | Description | Defining Class
| | Activating | Sent by the object to itself whenever the object is first activated (placed on the screen) | cUIObject |
| Command | Sent from external controls | DfBaseUIWindow |
| Construct_Object | Object constructor. Initializes the object during object creation in class definitions | cObject |
| Deactivating | Sent to the object when it is being removed from the focus tree | cUIObject |
| Destroy_Object | Sent when an object is about to be destroyed | cObject |
| End_Construct_Object | End of object constructor. | cObject |
| Entering | Fires when the focus is about to move to a new object, sent to the object receiving the focus | cUIObject |
| Entering_Scope | Sent to the object if its scope_state is true, and one of the objects within its scope takes the focus | cUIObject |
| Error_Report | Used by the error object to display errors | cUIObject |
| Exiting | Fires when the focus is about to move to a new object, sent to the object losing the focus | cUIObject |
| Exiting_Scope | Sent whenever the focus is moving to an object that is outside the current scope | cUIObject |
| Form_Button_Mouse_Down | A notification that the form's button has been selected with the mouse | DfBaseObject |
| Form_Button_Notification | A notification of a form button event | DfBaseObject |
| Mouse_Click | Sent whenever the first button of the mouse is double clicked on an item or in the edit window of the object | cUIObject |
| Mouse_Click2 | Sent whenever the second button of the mouse is double clicked on an item or in the edit window of the object | cUIObject |
| Mouse_Down | Sent whenever the first button of the mouse is pressed down while on an item or in the edit window of the object | cUIObject |
| Mouse_Down2 | Sent whenever the second button of the mouse is pressed down while on an item or in the edit window of the object | cUIObject |
| Mouse_Drag | Sent whenever the first button of the mouse is being held down while users drag the mouse cursor from one item or edit line of the object to the next | cUIObject |
| Mouse_Drag2 | Sent whenever the second button of the mouse is being held down while users drag the mouse cursor from one item or edit line of the object to the next | cUIObject |
| Mouse_Up | Sent whenever the first button of the mouse is released while on an item is in the edit window of the object | cUIObject |
| Mouse_Up2 | Sent whenever the second button of the mouse is released while on an item is in the edit window of the object | cUIObject |
| Notify_Application_Activation | Sends OnActivateApp or OnDeactivateApp | DfBaseObject |
| OnBeginningOfPanel | Sent by panel to notify all its objects when a beginning_of_panel message is executed | Container3d |
| OnDeltaPos | Provides actions based on the amount of change in this object and/or its value at the point the focus is moved off it | DfBaseObject |
| OnEnterArea | Hook for entering an area, sent to the entered object's container and its parent containers | cUIObject |
| OnEnterObject | Hook for entering an object, sent to the entered object | cUIObject |
| OnExitArea | Hook for exiting an area, sent to the exited object's container and its parent containers | cUIObject |
| OnExitObject | Hook for exiting an object, sent to the exited object | cUIObject |
| OnFileDropped | Provides a notification that a file drag and drop operation has occurred | DfBaseContainer |
| OnKillFocus | Sent whenever the object is about to lose the focus | Container3d |
| OnResize | Fires when the tab-page is created and whenever it is resized | |
| OnSetFocus | Sent whenever windows is about to give this object the focus | Container3d |
| OnWMMouseWheel | Mouse Wheel event sent when a mouse wheel event occurs | DfBaseDialog |
| Page_Delete | Used internally to delete a Windows control for a DataFlex object | cUIObject |
| Prompt_Callback | Sends a callback event to an object that requested a prompt object | Container3d |
| SetHScrollbox | Event sent in response to a horizontal scrollbar change | DfBaseDialog |
| SetVScrollbox | Event sent in response to a vertical scrollbar change | DfBaseDialog |
| Shadow_Display | Called whenever a change in shadow state occurs, or when an object is paged | Container3d |