Help! cannot change property of particle instanc

here is my setup, I need to randomize the color and rate of the particles, the colors are randomized but the rate never changes:

Create:

keyboard object

color1_particle object(type:oneshot resize:4x4 paint:red)

color2_particle object(type:oneshot resize:4x4 paint:green)

color3_particle object(type:oneshot resize:4x4 paint:blue)

color4_particle object(type:oneshot resize:4x4 paint:yellow)

family "particles" contains:

color1_particle

color2_particle

color3_particle

color4_particle

event: keyboard->On "T" pressed->

action:Create Object "particles"

action:particles->Set rate to floor(random(2,100))

Try moving the random particles action to a System > Every Tick event, and the particle rates should vary over time.

Otherwise, you may simply not be able to tell with up to 100 particles being created every second. Try temporarily changing to random(2,10) and you should be able to see the difference more easily to see if it's working.

Help forum is here by the way:

scirra.com/forum/how-do-i_forum45_page1.html

Regardless of how I create the particle I am unable to set the instance properties.

I tested this by simply doing the following with no success:

Create:

keyboard object

color1 particle object(rate:0 type:oneshot resize:4x4 paint:red)

event: keyboard->On "T" pressed->

action:Create Object "color1"

action:color1->Set rate to 50

event: color1->On created->

action:color1->Set rate to 50

Can you share your .capx?

Your wish is my command <img src="smileys/smiley42.gif" border="0" align="middle" />

docs.google.com/open

Is there any chance this is a defect with the object?