docs: def setColumnCount( self, count ):
          """
          Sets the number of columns used for this tree widget, updating the \
          column resizing modes to stretch the first column.
          
          :param      count | <int>
          """
          super(XColorTreeWidget, self).setColumnCount(count)
          
          header = self.header()
          header.setResizeMode(0, header.Stretch)
          for i in range(1, count):
              header.setResizeMode(i, header.Fixed)