Set default value for RadzenDropDown

I use a precompiled list to be displayed in the dropdown - 2 properties per entry are important - the Name and an ID (data stem from sql-server database originally)
The dropdown is build, filled and shows only the names as demanded. Now when the form is displayed I want the dropdown to preselect the entry over the provided id.
I've already tried some of the suggestions here and whatever I do - its only displaying the placeholder text

<RadzenDropDown Data=@datalist @bind-Value=@mydata.ga_id TValue="int" AllowClear="false"
 Placeholder="Wähle aus ..."style="width: 100%;" TextProperty="Name" ValueProperty="ga_id"
 Name="Ga_Id" Change="@(args => OnChange(args, "Ga_ID"))" />

What do I need to change? Or does it only work on string like so many examples show?

This means that the object in the collection assigned to Data have ga_id property.

Our online demo shows how to use the component and preselect values. Check the bind to model property example - it uses an int for the value.

Solved the mystery ... My teammate that build the server-part of the webassembly "coincidentally" used test-data for the items that give the datalist .. and his test-data dont match the actual data - exactly the ga_id column is deviating from the real data.. So no wonder I couldnt bring the ga_id of the actual object (57) to match the datalist entry which carries ga_id of 1
thanks for the hints @Radzen Team