Force a symbol to be "on top"

I have two different symbols that appear on the same day. I want to be able to choose which symbol appears on top. Is this possible?

With the tool, click the symbol to select it. If it is difficult to select the correct symbol with the mouse, then click on one of the symbols and use the keyboard arrow keys to select the proper one and then select Edit | Symbol Text (or Cntrl+E) and then change the time to a later time.
On the toolbar, choose the small Size/Color tab.
Under Other Overrides, Symbol is on top.