I tried to set up Radcombobox with "check all" option which as the demo did in the below link:
http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/checkboxes/defaultcs.aspx
However, even I set EnableCheckAllItemsCheckBox="true" , the check all option doesn't show at all. Finally I copied the exact code from the demo to my test page, the "check all" option still doesn't appear. another interesting thing is that I can't find the EnableCheckAllItemsCheckBox property in the properties window of visual studio.
Anything I did wrong? plus, how can I get " x item checked" information working in the Radcombobox if the concatenated string length of options being selected is longer than the width of combobox? as the pic I attached in the image.
any suggestions I would be really appreciated.
Thanks.