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Date:Mon Feb 1 16:20:36 2000 
Subject:my problem 
From:Daniel J Birks 
Volume-ID:1000201.05 

Hi All,
I've been currently using a rcmenulib to create a GUI which calls some pop
procedures which create instance of objects for use in sim_agent:

for some reason whenever I attempt to catually create the object from the
gui I recieve the following error message...

;;; MISHAP - USERSTACK HAS CHANGED AFTER ASYNCHRONOUS TRAP PROCEDURE
;;; INVOLVING:  <procedure> 
;;; DOING    :  

heres an example of the code used to call the procedure:
	
'Specify Object Parameters'
    ['Create Obstacle' [POP11 create_obstacle(^s,^x,^y)]]

        [SLIDERS
            {label parameters}
            {barcol 'white'} {blobcol 'grey'}
            {spacing 6} {radius 4}:

            [x
                {0 600 0} round
                [[{-5 10 'x_pos'}] []]
            ]

            [y
                {0 600 0} round
                [[{-5 10 'y_pos'}] []]
            ]

            [s
                {1 3 1} round
                [[{-5 10 'size'}] []]
            ]



I've tried using external_defer_apply but this doesn't seem to make a
difference (but maybe that's me ?!)

anyway any help would be gratefully appreciated 

Cheers

Dan.............