Please refer to the attached sample project and gif file illustrating the problem. Workaround: Sub New() InitializeComponent() AddHandler Me.RadGridView1.CreateCell, AddressOf RadGridView_CreateCell End Sub Public Class CustomGridFilterCellElement Inherits GridFilterCellElement Protected Overrides ReadOnly Property ThemeEffectiveType() As Type Get Return GetType(GridFilterCellElement) End Get End Property Public Sub New(column As GridViewDataColumn, row As GridRowElement) MyBase.New(column, row) End Sub Protected Overrides Function ApplyFormatString(value As Object) As String Return CDate(value).ToString("dd.MM.yyyy") End Function End Class