How to shrink a DataGrid in a RadzenSplitterPane so that Virtualization works?

I have something like this:

<RadzenSplitter Orientation="Orientation.Vertical">
  <RadzenSplitterPane><MyCoolList /></RadzenSplitterPane>
  <RadzenSplitterPane></RadzenSplitterPane>
</RadzenSplitter>

Inside the MyCoolList there is a RadzenDataGrid as the only element.

The data grid loads data dynamically using virtualization. However, in the splitter, the whole grid is populated, thus giving me a very large data grid with thousands of entries disappearing behind the visible part of the splitter pane, and no scrollbar.

What am I missing to automatically shrink the splitter pane, make scrollbars appear in the datagrid etc.?

You need to specify height: