`TfpgTreeView`
pl		OnChange
pl		OnExpand
pl	ro	OnDoubleClick
pl	ro	OnShowHint

`TfpgWidget`
pt		OnClick
pt		OnDoubleClick
pt		OnEnter
pt		OnExit
pt		OnKeyPress
pt		OnMouseDown
pt		OnMouseEnter
pt		OnMouseExit
pt		OnMouseMove
pt		OnMouseUp
pt		OnPaint
pt		OnResize
pt		OnShowHint

`TfpgWindow`