Name 

Description 

 

OnActivate 

Occurs when the form becomes active. 

 

OnCanResize 

Occurs when an attempt is made to resize the control. 

 

OnClick 

Occurs when the user clicks the control. 

 

OnClose 

Occurs when the form closes. 

 

OnCloseQuery 

Occurs when close is attempted. 

 

OnCreate 

Occurs when the form is created. 

 

OnDblClick 

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

 

OnDeactivate 

Occurs when the form loses focus. 

 

OnDestroy 

Occurs when the form is destroyed. 

 

OnDragDrop 

Occurs when the user drops an object being dragged. 

 

OnDragOver 

Occurs when the user drags an object over a control. 

 

OnHelp 

Occurs when the form receives a request for help. 

 

OnHide 

Occurs when the form is hidden (that is, when its Visible property is set to false). 

 

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. 

 

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. 

 

OnPaint 

Occurs when the form is redrawn. 

 

OnResize 

Occurs immediately after the control is resized. 

 

OnShortCut 

Occurs when the user presses a key (before the OnKeyDown event). 

 

OnShow 

Occurs when the form is shown (that is, when its Visible property is set to true).