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ShellBrowser Delphi Components Documentation | 
Occurs when the user releases a mouse button that was pressed with the mouse pointer over a component.
property OnMouseUp;
 See  TControl.OnMouseUp. We noticed that the WM_LBUTTONUP message is not reliably send by the underlying ActiveX control, so you should not rely on this event. There is nothing we can do about it.
TControl.OnMouseUp. We noticed that the WM_LBUTTONUP message is not reliably send by the underlying ActiveX control, so you should not rely on this event. There is nothing we can do about it.