Name 

Description 

 

OnChange 

Occurs when the text for the edit control may have changed. 

 

OnClick 

Occurs when the user clicks the control. 

 

OnDblClick 

Occurs when the user double-clicks the left mouse button when the mouse pointer is over the control. 

 

OnDragDrop 

Occurs when the user drops an object being dragged. 

 

OnDragOver 

Occurs when the user drags an object over a control. 

 

OnDropDown 

This is OnDropDown, a member of class TDBLookupCombo. 

 

OnEndDrag 

Occurs when the dragging of an object ends, either by dropping the object or by canceling the dragging. 

 

OnEnter 

Occurs when a control receives the input focus. 

 

OnExit 

Occurs when the input focus shifts away from one control to another. 

 

OnKeyDown 

Occurs when a user presses any key while the control has focus. 

 

OnKeyPress 

Occurs when a key is pressed. 

 

OnKeyUp 

Occurs when the user releases a key that has been pressed. 

 

OnMouseDown 

Occurs when the user presses a mouse button with the mouse pointer over a control. 

 

OnMouseMove 

Occurs when the user moves the mouse pointer while the mouse pointer is over a control. 

 

OnMouseUp 

Occurs when the user releases a mouse button that was pressed with the mouse pointer over a component. 

 

OnStartDrag 

Occurs when the user begins to drag the control or an object it contains by left-clicking on the control and holding the mouse button down.