Vb.net - how to select text in richtext column/cell easier?

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VB

I have a GridView with a Checkbox Column, normal Text Colums and one Richtext Column.

Wenn the checkbox in one row is checked, I want to select and copy all formatted text from the Richtext cell in that row.

That does not work because the editingControl is Nothing.

When I use manual Clicks, I need one click to enter the cell, another one to start Edit Mode and a double click to select the Richtext.

My favorite version wold be, to check a checkbox with the mouse and select and copy the formatted richtext via code.

Private Sub LogReview_CheckBoxCellClick(sender As Object, e As EventArgs) Handles masterDetail.DoubleClick 

        Dim strLineNr As String
        Dim strLine As String

        masterDetail.CurrentRow.Cells(6).Selected = True

        editingControlRTF.SelectAll()
        strLine = editingControlRTF.SelectedText

What I have tried:

I have tried diferent handles

Handles masterDetail.DoubleClick, masterDetail.CurrentCellDirtyStateChanged, masterDetail.CellContentClick

The result is as described above.