Visual basic datagridview selectionchanged stopped working

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Visual-Studio

Basic

Hello,

my Problem is an DataGridView named "Datenansicht".

Dim sql As String
Dim data As New DataSet
Dim dataShow As New DataSet

sql = "select Eintrag_ID, Erfasser, Kategorie, Uhrzeit from Nutzereinträge"

db.ReturnDatagrid(sql).Fill(dataShow)

This is how the DataGridView is filled.

Now there are Buttons who will filter the Entries in the "Datenansicht"

These re-set the DataGridView:

Dim sql As String = "select Value,ValueType from DropDownValues order by ValueType"
Dim data As New DataSet

sql = "select Erfasser, Kategorie, Uhrzeit from Nutzereinträge where Eintrag_ID Not in (Select Eintrag_ID from QMEinträge)"

db.ReturnDatagrid(sql).Fill(data)
Datenansicht.DataSource = Nothing
Datenansicht.DataSource = data.Tables(0)
Datenansicht.Refresh()

This works, the new, filtered entries are displayed in the "Datenansicht".

But it completely breaks the events that correspond with the DataGridView "Datenansicht"

Datenansicht_SelectionChanged

completely stops working

What I have tried:

I tried resetting the data source, clearing the whole datagridview... Nothing worked.