cannot pass values with weblink() to destination class in EP

migi

Hi,
I'm using WebLink()-class and webaction-menu item to execute the destination class. However I can't get the param value out of the args in the destination side. I'm sure it's there but I just can't get it out.
Example:
I initialize the parameters for testing;

webLinkAddItem = new WebLink();
webLinkAddItem.addOrUpdateExtraParam('test', 'testing');
webLinkAddItem.parm("something");
webLinkAddItem.menufunction(new WebActionMenuFunction(webactionitemstr(EPAddLine)));

Then in the destination class Main()-method:
str searchval = webSession().getParm('WP');
str val2 = webSession().getParm('test');

These both won't return anything. I'm sure it's there because the string in websession shows them:

["__EVENTARGUMENT"->"EPAddLine?WP=something¤&test=testing&WTID=175&WREC=5639142111&WKEY=[65534:5639142111]....

I can get out WTID and WREC values though, I wonder why?
Please, could someone answer this.