I have a webdropdown Control on a webform that is bound to a sqldatasource that shows the distinct fields of a column. Multiselect is enabled, Pading is enabled, keefocus on selection is on, autocomplete is off, Diplay mode is DropdownList

When i run my solution in debug and want to select something, about a third of the time the dropdown closes again instantly after opening, it happens randomly and more often in IE than Chrome, but is very confusing and rather annoying.