_screen.事件。事件如下
Activate Click DblClick
Deactivate Destroy DragDrop
DragOver Error GotFocus
Init KeyPress Load
LostFocus middleclick MouseDown
MouseMove MouseUp MouseWheel
Moved OLECompleteDrag OLEDragDrop
OLEDragOver OLEGiveFeedBack OLESetData
OLEStartDrag Paint QueryUnload
Resize RightClick Scrolled
Unload