I suggest you to add these codes on an event which trigger AJAX callback or put these codes in Page_Load() events:

WebCombo1.AspNetAjaxSettings.UpdateControlScripts = true;
WebCombo1.AspNetAjaxSettings.UpdateControlStyles = true;

Hope this helps.

Hi Dicky,

Unfortunately this has not resolved the issue. What would be causing the figure 6 to be appearing?

Thanks

which browser do u use and which version

Hi Aiyer,

This could be happens because when AJAX callback process the scripts and image resources won't be loaded. That's why you need to set UpdateControlScripts call UpdateControlStyles into true value.

Another thing if you create WebCombo programatically, I suggest you to add these codes before UpdateControlScripts and UpdateControlStyles:

WebCombo1.AspNetAjaxSettings.CreatedAtRuntime = true;

Aiyer, does the "6" symbol turn into arrow properly after the alert? (eg, after you clicked OK on the alert box).

As I remembered, I has ever replicated the same problem as yours. If i am not mistaken, this '6' will show if the alert showed and will turn back into 'arrow' after you closed the alert. In fact, WebCombo need some timeout because the scripts have not been loaded yet. So, please try to show alert with using timeout. Hope this helps.

Regards,
Handy 

Calling the alert in a timeout, eg, setTimeout(function() { alert('Some info'), 10) should resolve the problem. 

The 'arrow' was displayed because alert is called first before the WebCombo finished its initialization. Hope this helps.