The Mousedown event does not seem to trigger on iPad and iPhone when the optionlist is touched.
Somehow android does not have that problem.
Comments: I tried to reproduce this behavior with the [ajaxcontroltoolkit.devexpress.com](http://ajaxcontroltoolkit.devexpress.com/ComboBox/ComboBox.aspx) sample site, but have not managed. Would you please provide more details about your environment (OS and browser versions)? Recording a video with your actions will help us a lot (you can use the [Jing tool](https://www.techsmith.com/jing.html) for this purpose).
Somehow android does not have that problem.
Comments: I tried to reproduce this behavior with the [ajaxcontroltoolkit.devexpress.com](http://ajaxcontroltoolkit.devexpress.com/ComboBox/ComboBox.aspx) sample site, but have not managed. Would you please provide more details about your environment (OS and browser versions)? Recording a video with your actions will help us a lot (you can use the [Jing tool](https://www.techsmith.com/jing.html) for this purpose).