FIX. RadDropDownList - binging the control in a BeginUpdate/EndUpdate block will cause the control to select an invalid item
To reproduce:
Dim dt As New DataTable
dt.Columns.Add("Name")
For index = 1 To 20
dt.Rows.Add("Some value " & index)
Next
With ddLLessonEmployee
.BeginUpdate()
.DataSource = dt