sequence diagram funct calls another funct

How would you show this using
Umbrello.

Eg (in java):

class myClass
{
   public static void main(String args[])
   {
      int x;
      x = funct1(x);
   }
   public int funct1(int x)
   {
      x++;
   }
}

main calls funct1, so the diagram should show:

An instance of the class myClass, then the function main running.  Then
main calling the function funct1.

Something like this:

--------------------
|  mc : myClass |
--------------------
          |   1.1: main(args[] : string) : void
          |---------
          |           |---------
          |           |          |  1.2: funct1(x : int) : int
          |           |          |
          |           |<-------
          |<-------
          |
          |

I am able to do the first function call to main().  But what about the call 
to
funct1(int x)?

Regards,

  Kan

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