#108 fix: property TTreeNode.Focused

[Petr Kozelka]

Currently, the property TTreeNode.Focused is defined
by functions GetSelected and SetSelected. I believe
this is a bug, and should be defined by *Focused
methods instead.
Please change it to this
(file clx/QComCtrls.pas, line 2231):

property Focused: Boolean read GetFocused write
SetFocused;