I created a simple sample of unbound WebCombo created programmaticallly. The sample page is enclosed as attachment (ProgrammaticUnboundWebComboSample.zip). The combo specification is as follow:

• RenderingMode is HTML5
• ResultBoxWindowType is Normal
• Doctype is HTML5
• using WebCombo 6.0.7200.260

The reported problem, the arrow of the combo disappears, doesn't occur. Viewing the page in IE 11 and the drop down arrow of WebCombo appear without any problem. I also tried to click the arrow and select an item.

I noticed that the drop down arrow of WebCombo disappear after user select an item if the page is viewed in compatibility view. Please ensure that the page is not viewed in compatibility view.

If the problem still persist, please modify ProgrammaticUnbound sample until the problem can be replicated. Have the sample sent back to us to be investigated further.