Loading Message not shown when ShowDropDownOnTextboxClick = true and clicking in textbox.

[Tobias]

Is this behavoir a known bug, or is there something wrong with my implementation?

My implementation of RadComboBox locks like following:

<tc:RadComboBox ID="_radComboBox" runat="server"
                                Width="250px"
                                Height="250px"
                                CssClass="stringBox"
                                AutoPostBack="true"
                                MarkFirstMatch="true"
                                EnableLoadOnDemand="true"
                                HighlightTemplatedItems="true"
                                EnableVirtualScrolling="true"
                                ShowMoreResultsBox="true"
                                ShowWhileLoading="true"
                                LoadingMessage="Loading..."
                                ShowDropDownOnTextboxClick="true"
                                OnSelectedIndexChanged="OnSelectedIndexChanged"
                                OnItemDataBound="OnItemDataBound"
                                OnItemsRequested="OnItemsRequested"
                                OnLoad="OnComboBoxLoad">

I requestet the data in the MethodCall "OnItemsRequested".

If user clicks in the Textbox an empty ListBox is rendering and in background the "OnItemsRequested" method get called.
When this method returns values, they are shown as normal in the listbox.
Now, if the user should request more then the first items (per Default every call of OnItemsRequested returns 10 Items), the "Loading..." string is shown above the List. 
This is what i expected the listBox should do for the first call on DropDownTextboxClicked.

It is a problem, when the "OnItemsRequested" method needs some time for response.
For the user it looks like, there a no items in list. (Because of blank list)

Is there something wrong with my implementation, or is this a known bug of RadComboBox?

Im using Telerik.Web.UI.dll in Version 2012.1.215.40.

[Chris]

I am also experiencing this issue with the 2012 Q3 controls. Here is a thread with a link to vote for this to be fixed:

http://www.telerik.com/community/forums/aspnet-ajax/combobox/radcombobox-can-not-show-any-loading-information-when-only-dropdownlist-is-opene.aspx#2358999

[Nencho]

Hello Tobias,

Actually, we are aware of the described problem and here is the PITS item on the matter. We are doing our best in order to fix that issue as soon as possible.

Kind regards,
Nencho
the Telerik team