Good morning.
I managed to solve the problem.
I got the code:
Private Sub gridgrouping_tablecontrolcurrentcellshowingdropdown(ByVal sender As System.Object, ByVal e As Syncfusion.Windows.Forms.Grid.Grouping.GridTableControlCurrentCellShowingDropDownEventArgs) Handles gridGrouping.TableControlCurrentCellShowingDropDown
Dim widthcollumn As Integer = gridGrouping.TableDescriptor.Columns(0).Width
If (e.Inner.Size.Width < widthcollumn) Then
widthcollumn += 17
e.Inner.Size = New Size(widthcollumn, e.Inner.Size.Height)
End If
End Sub
thank