I am using this tooltip in content page.
here is my code
Protected Sub RadToolTipManager1_AjaxUpdate(ByVal sender As Object, ByVal e As Telerik.Web.UI.ToolTipUpdateEventArgs) Handles RadToolTipManager1.AjaxUpdate
Me.UpdateToolTip(e.Value, e.UpdatePanel)
End Sub
Private Sub UpdateToolTip(ByVal elementID As String, ByVal panel As UpdatePanel)
Dim ctrl As Control = Page.LoadControl("UserControlDetails.ascx")
panel.ContentTemplateContainer.Controls.Add(ctrl)
Dim UserDetails As UserControlDetails = DirectCast(ctrl, UserControlDetails)
UserDetails.UserIDGUID = elementID
End Sub
Private Sub RadGridUsers_ItemDataBound(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles RadGridUsers.ItemDataBound
If e.Item.ItemType = GridItemType.Item OrElse e.Item.ItemType = GridItemType.AlternatingItem Then
Dim target As Control = e.Item.FindControl("targetControl")
If Not [Object].Equals(target, Nothing) Then
If Not [Object].Equals(Me.RadToolTipManager1, Nothing) Then
Dim currentRow As DataRowView = DirectCast(e.Item.DataItem, DataRowView)
Me.RadToolTipManager1.TargetControls.Add(target.ClientID, currentRow.Row("unique_identifier").ToString(), True)
End If
End If
End If
End Sub
Private Sub RadGridUsers_ItemCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles RadGridUsers.ItemCommand
If e.CommandName = "Sort" OrElse e.CommandName = "Page" Then
RadToolTipManager1.TargetControls.Clear()
End If
End Sub