InplaceAdd with ServiceLookupEditorBase

[Gulgil1]

Do I need to do someting special to get InplaceAdd = true to work with ServiceLookupEditorBase?
[MyLookupTableCustomEditor(InplaceAdd = true, DialogType = "abc.MyLookupTable")]

I have a large table that used a regular lookup with lookupscript.
On the Row
LookupScript("abc.MyLookupTable", Expiration = -1)
public sealed class MyLookupTableRow : Row<MyLookupTableRow.RowFields>, IIdRow, INameRow

And on the column:
[LookupEditor(typeof(MyLookupTable), InplaceAdd = true)]

That worked perfectly. (no need to specify DialogType)

But It's a big table so I made a custom editor from ServiceLookupEditorBase and removed the lookupscript.
That also worked fine when InplaceAdd is not added. I get the dropdown, I can search, select etc.
When I add InplaceAdd to it, I can still search, select etc. But when I click the add/edit button it fails:

Exception: "abc.MyLookupTable" dialog class not found! 
Make sure there is such a dialog type under the project root namespace, 
and its namespace parts start with capital letters like MyProject.MyModule.MyDialog.

If using ES modules, make sure the dialog type has a decorator like 
@Decorators.registerClass('MyProject.MyModule.MyDialog') with the full name
and "side-effect-import" this dialog class from the current 
"page.ts/grid.ts/dialog.ts file (import "./path/to/MyDialog.ts").

If you had this error from an editor with the InplaceAdd option, verify that the lookup key
and dialog type name match case-sensitively, excluding the Dialog suffix.
Specify the DialogType property in the LookupEditor attribute if it is not.

I added DialogType to the attributes, but it still fails with the same error.

Do I need to add a lookupkey, since it says "verify that the lookup key and dialog type name match case-sensitively, excluding the Dialog suffix"

[VictorTomaili]

For esm project you may need to add dialog type as side effect import in your main dialog. For example, if you open an order dialog and you click on the product edit, your order dialog should have [ProductDialog] line between the class and imports.

[Gulgil1]

Perfect. Just what was missing...

I added import of the relevant Dialog in my Editor file, and it worked.
Just needed to "use" it once in the code, since import doesn't import unused elements.