Cell selection event handler

def OnCellSelected(self, event):
        """Cell selection event handler"""

        key = row, col, tab = event.Row, event.Col, self.grid.current_table

        # Is the cell merged then go to merging cell
        cell_attributes = self.grid.code_array.cell_attributes
        merging_cell = cell_attributes.get_merging_cell(key)
        if merging_cell is not None and merging_cell != key:
            post_command_event(self.grid, self.grid.GotoCellMsg,
                               key=merging_cell)

            # Check if the merging cell is a button cell
            if cell_attributes[merging_cell]["button_cell"]:
                # Button cells shall be executed on click
                self.grid.EnableCellEditControl()

            return

        # If in selection mode do nothing
        # This prevents the current cell from changing
        if not self.grid.IsEditable():
            return

        # Redraw cursor
        self.grid.ForceRefresh()

        # Disable entry line if cell is locked
        self.grid.lock_entry_line(
            self.grid.code_array.cell_attributes[key]["locked"])

        # Update entry line
        self.grid.update_entry_line(key)

        # Update attribute toolbar
        self.grid.update_attribute_toolbar(key)

        self.grid._last_selected_cell = key

        event.Skip()