I'm trying to change the icon, caption and tooltip of an button in my custom toolbar. I'm using the add-in process inside Visual Studio. Ideally I don't want an icon, just the text "English" or "Spanish" to appear on the toolbar depending on what the user clicks. If I can't have the text then an icon that can alternate between 2 different choices would be ok.If I try to change the FaceID, ToolTip or Caption ArcMap crashes. I can get the contextHelpItem.Name property so I know I'm getting the correct button and toolbar.ArcGIS 10.1, Visual Studio 2010, VB.net Dim documentBars As ICommandBars = m_Application.Document.CommandBars Dim barID As UID = New UIDClass barID.Value = "BGC_Engineering_Inc_BGCLayout_Tool_v4_BGC_Layout_Tool" '"{ebecdd6c-d4da-4523-b478-aab7f940b87e}" Dim barItem As ICommandItem = documentBars.Find(barID, False, False) If Not (barItem Is Nothing) Then ' AndAlso barItem.Type = ESRI.ArcGIS.Framework.esriCommandTypes.esriCmdTypeToolbar Then Dim commandBar As ICommandBar = CType(barItem, ICommandBar) Dim commandID As ESRI.ArcGIS.esriSystem.UID = New ESRI.ArcGIS.esriSystem.UIDClass commandID.Value = "BGC_Engineering_Inc_BGCLayout_Tool_version_4_btn_Language" Dim contextHelpItem As ICommandItem = commandBar.Find(commandID, False) If Not contextHelpItem Is Nothing Then ' get bitmap 'Dim newIcon As System.Drawing.Bitmap If g_bEnglish = True Then 'newIcon = New System.Drawing.Bitmap(Me.GetType(), "Images/btn_Language_en.bmp") 'contextHelpItem.FaceID = ESRI.ArcGIS.ADF.COMSupport.OLE.GetIPictureDispFromBitmap(newIcon) 'contextHelpItem.Style = esriCommandStyles.esriCommandStyleTextOnly 'contextHelpItem.Caption = "English" contextHelpItem.Tooltip = "Now English" Else 'newIcon = New System.Drawing.Bitmap(Me.GetType(), "Images/btn_Language_es.bmp") 'contextHelpItem.FaceID = ESRI.ArcGIS.ADF.COMSupport.OLE.GetIPictureDispFromBitmap(newIcon) 'contextHelpItem.Style = esriCommandStyles.esriCommandStyleTextOnly 'contextHelpItem.Caption = "Spanish" contextHelpItem.Tooltip = "Now Spanish" End If End If End If