`TfpgTrackBar`
pl	ro	OnChange
pl	ro	OnEnter
pl	ro	OnExit
pl	ro	OnKeyPress
pl	ro	OnMouseDown
pl	ro	OnMouseEnter
pl	ro	OnMouseExit
pl	ro	OnMouseMove
pl	ro	OnMouseUp
pl	ro	OnShowHint

`TfpgBaseTrackBar`

`TfpgWidget`
		OnDragEnter
		OnDragLeave
		OnDragDrop

`TfpgWindow`

`TfpgWindowImpl`

`TfpgX11Window`

`TfpgWindowBase`

`TfpgComponent`