Doing visible a lookup and load it in EP

Hello!

I'm doing some changes in PurchReqCreate form (WebControl in EP), where I've cleaned one date field for example and it's ok. I'm doing that throught the DataSet --> initValue() method.

In this webcotrol, there are two lookups (company and project). 

As I can see in PurchReqCreate form (Ax client), I write the same in the DataSet, to initialized the first lookup:

purchReqTable.CompanyInfoDefault = CompanyInfo::find().RecId;

Now, I see the company in the lookup but the second lookup is hidden. I don't know how or where I have to "call" the event that load this project lookup.

I've tried:

purchReqTable_ds.object(fieldNum(PurchReqTable, ProjId)).enabled(true);

purchReqTable.ProjId = "";

purchReqTable_ds.object(fieldNum(PurchReqTable, CompanyInfoDefault)).modified();

but no result is successful.

If I go to the ax client everything is working perfectly.

Any help will be wellcome... Thanksss!!