Data is not loaded without Expression

[#1]

I have created extension to show data in some custom way. Have one problem - data is not loaded without selected expression in extensions proporeties.

There is my Definition.xml:

<?xml version="1.0" encoding="utf-8"?>

<ExtensionObject Label="Tree Table" Description="Tree-table widget" PageHeight="50000">

    <Dimension Multiple="" Label="Dimensions:" TargetName="Dimension" Initial=""/>

    <Expression Multiple="" Label="Expressions:" TargetName="Expression" Initial="" />

    <Initiate Name="Chart.Title" value="Tree Table" />

    <Initiate Name="Caption.Text" value="Tree Table" />

</ExtensionObject>

If add just few dimensions this.Data.Rows is empty. If add any expression it works fine. Can someone explain this behaviour?

[Brian_Munz · Accepted solution]

An extension is basically a straight table as far as QlikView is concerned, so it needs an expression to be set. If its causing a problem, just set it to 1