Name 

Description 

 

OnAlignInsertBefore 

Occurs when an object with custom alignment is aligned. 

 

OnAlignPosition 

Occurs when an object with custom alignment is aligned. 

 

OnCanResize 

Occurs when an attempt is made to resize the control. 

 

OnCloseUp 

Occurs when the drop-down list closes up due to some user action. 

 

OnConstrainedResize 

Adjust resize constraints. 

 

OnDockDrop 

Occurs when another control is docked to the control. 

 

OnDockOver 

Occurs when another control is dragged over the control. 

 

OnDrawItem 

Occurs when an item in an owner-draw combo box needs to be displayed. 

 

OnEndDock 

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

 

OnGetSiteInfo 

Returns the control's docking information. 

 

OnMeasureItem 

Occurs when an item in a csOwnerDrawVariable combo box needs to be redisplayed. 

 

OnMouseActivate 

Occurs when the user presses a mouse button with the mouse pointer over a control and the parent form is not active. 

 

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. 

 

OnMouseWheel 

Occurs when the mouse wheel is rotated. 

 

OnMouseWheelDown 

Occurs when the mouse wheel is rotated downward. 

 

OnMouseWheelUp 

Occurs when the mouse wheel is rotated upward. 

 

OnResize 

Occurs immediately after the control is resized. 

 

OnSelect 

Occurs when the user selects a string in the drop-down list. 

 

OnStartDock 

Occurs when the user begins to drag a control with a DragKind of dkDock. 

 

OnUnDock 

Occurs when the application tries to undock a control that is docked to the windowed control.