How to use a runtime trigger?

AddCondition(0, cf_trigger, "addisplayed", "My category", "ad_displayed", "Description for my condition!", "addisplayed");[/code:2k0zagp5]
in runtime.js:
[code:2k0zagp5]Cnds.prototype.addisplayed = function (state)
	{
	    return true;
};[/code:2k0zagp5]

Now:
Case 1:
if I put this code 
[code:2k0zagp5]var self=this;
 self.runtime.trigger(cr.plugins_.GoogleIMA.prototype.cnds.addisplayed,self);[/code:2k0zagp5]
under instanceProto.onCreate = function()
	 it works

Case 2 : if I put the same code under an action, it doesn't work: Acts.prototype.MyAction = function (myparam)
	{

I tried to make :
 [code:2k0zagp5]instanceProto.addisplayed= function()
	{
	var self=this;
 self.runtime.trigger(cr.plugins_.GoogleIMA.prototype.cnds.addisplayed,self);}[/code:2k0zagp5]

and call from action: this.addisplayed(); but doens't work.

So how do I trigger the event from actions?

Thanks

EDIT:
It seams that  calling this.addisplayed(); from actions works but :
if I wrap it inside a function it doesn't