To create an activation at creation of the message:
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Select the Procedure Call Message tool in the Palette.
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Click the lifeline of the sender object or actor and, while holding down the mouse button, drag the cursor towards the receiver object.
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Release the mouse button on the object symbol of the receiver.
The message is created along with activations on the lifelines of both the sender and receiver (note that activations are not created on the lifelines of actors).