Matches the tree selection to the views selection.

def _selectTree( self ):
        """
        Matches the tree selection to the views selection.
        """
        self.uiGanttTREE.blockSignals(True)
        self.uiGanttTREE.clearSelection()
        for item in self.uiGanttVIEW.scene().selectedItems():
            item.treeItem().setSelected(True)
        self.uiGanttTREE.blockSignals(False)